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Oil-Dri of America Quarterly Balance Sheets Chart

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Oil-Dri of America Quarterly Balance Sheets Table

Quarterly
 | 
Annual
 
Unit: USD2025-04-30 2025-01-31 2024-10-31 2024-07-31 2024-04-30 2024-01-31 2023-10-31 2023-07-31 2023-04-30 2023-01-31 2022-10-31 2022-07-31 2022-04-30 2022-01-31 2021-10-31 2021-07-31 2021-04-30 2021-01-31 2020-10-31 2020-07-31 2020-04-30 2020-01-31 2019-10-31 2019-07-31 2019-04-30 2019-01-31 2018-10-31 2018-07-31 2018-04-30 2018-01-31 2017-10-31 2017-07-31 2017-04-30 2017-01-31 2016-10-31 2016-07-31 2016-04-30 2016-01-31 2015-10-31 2015-07-31 2015-04-30 2015-01-31 2014-10-31 2014-07-31 2014-04-30 2014-01-31 2013-10-31 2013-07-31 2013-04-30 2013-01-31 2012-10-31 2012-07-31 2012-04-30 2012-01-31 2011-10-31 2011-07-31 2011-04-30 2011-01-31 2010-10-31 2010-04-30 2009-10-31 2007-01-31 2006-10-31 2006-04-30 2006-01-31 2005-10-31 2005-07-31 
                                                                     
  current assets                                                                   
  cash and cash equivalents36,475,000 22,589,000 12,506,000 23,481,000 46,821,000 27,800,000 29,579,000 31,754,000 29,746,000 13,951,000 10,470,000 16,298,000 22,825,000 29,009,000 13,055,000 24,591,000 30,318,000 30,708,000 31,291,000 40,890,000 20,548,000 21,569,000 19,260,000 21,862,000 16,224,000 9,375,000 9,019,000 12,757,000 10,613,000 9,381,000 8,401,000 9,095,000 13,603,000 17,560,000 15,991,000 18,629,000 17,194,000 13,827,000 21,011,000 20,138,000 14,379,000 12,763,000 8,406,000 16,230,000 16,436,000 12,082,000 17,776,000 24,035,000 22,649,000 25,430,000 27,177,000 27,093,000 25,649,000 27,359,000 21,000,000 17,885,000 15,452,000 19,282,000 16,099,000 21,639,000 16,028,000 9,572,000 8,127,000 7,825,000 6,873,000 5,853,000 5,945,000 
  accounts receivable65,517,000 66,086,000 70,544,000  60,003,000                                                               
  inventories56,531,000 55,231,000 56,025,000 54,236,000 45,468,000 46,230,000 43,832,000 42,612,000 36,664,000 37,938,000 40,419,000 35,562,000 34,951,000 29,797,000 28,692,000 23,598,000 23,584,000 23,655,000 23,493,000 23,893,000 24,096,000 22,679,000 23,803,000 24,163,000 26,738,000 28,123,000 25,413,000 22,521,000 23,415,000 22,603,000 22,759,000 22,615,000 23,813,000 23,217,000 23,567,000 23,251,000 25,025,000 22,949,000 21,486,000 21,369,000 24,285,000 23,661,000 24,332,000 24,483,000 24,401,000 22,734,000 22,344,000 20,723,000 21,349,000 22,186,000 20,998,000 19,673,000 19,389,000 21,640,000 22,263,000 19,230,000 18,331,000 17,254,000 17,296,000 17,390,000 16,398,000 14,429,000 15,947,000 16,081,000 15,444,000 14,227,000 12,686,000 
  prepaid expenses and other assets4,903,000 5,110,000 5,040,000 7,270,000    2,854,000 2,202,000 2,413,000 2,366,000 3,664,000 6,489,000 5,524,000 6,711,000 6,742,000 4,987,000 3,720,000 2,183,000 3,064,000 2,460,000 1,555,000 1,551,000 3,084,000 3,100,000 1,924,000 3,941,000 2,899,000 2,402,000 4,140,000 3,690,000 2,304,000 2,203,000 4,658,000 1,992,000 901,000 1,681,000 3,885,000 1,913,000 1,199,000 2,074,000 2,221,000 2,574,000 3,745,000 3,538,000 3,087,000 2,252,000 1,563,000 2,153,000 2,253,000 2,372,000 2,888,000 2,443,000 2,209,000 3,995,000 4,672,000 2,193,000 2,214,000 2,113,000 1,637,000 2,051,000 5,118,000 5,069,000 5,639,000 5,369,000 5,470,000 4,347,000 
  total current assets163,426,000 149,016,000 144,115,000 147,158,000 158,846,000 139,433,000 136,766,000 136,507,000 134,065,000 119,588,000 114,336,000 114,681,000 113,702,000 116,754,000 97,504,000 101,942,000 103,870,000 102,787,000 102,285,000 108,420,000 94,113,000 86,181,000 85,545,000 89,276,000 86,808,000 82,300,000 85,219,000 83,014,000 87,132,000 94,154,000 88,901,000 97,017,000 98,077,000 92,778,000 85,999,000 91,173,000 89,945,000 92,720,000 86,117,000 82,643,000 78,491,000 77,028,000 74,361,000 83,516,000 87,757,000 89,353,000 96,542,000 103,372,000 99,421,000 97,177,000 95,997,000 95,202,000 92,164,000 94,101,000 91,879,000 91,816,000 89,516,000 93,652,000 74,047,000 76,392,000 74,296,000 76,607,000 73,725,000 77,381,000 81,608,000 65,322,000 63,096,000 
  other assets                                                                   
  property, plant and equipment139,837,000 137,416,000 137,947,000                                                                 
  goodwill15,745,000 15,706,000 15,674,000 15,443,000 3,618,000 3,618,000 3,618,000 3,618,000 3,618,000 3,618,000 3,618,000 3,618,000 3,618,000 9,262,000 9,262,000 9,262,000 9,262,000 9,262,000 9,262,000 9,262,000 9,262,000 9,262,000 9,262,000 9,262,000 9,262,000 9,262,000 9,262,000 9,262,000 9,034,000 9,034,000 9,034,000 9,034,000 9,034,000 9,034,000 9,034,000 9,034,000 9,034,000 9,034,000 9,034,000 9,034,000 9,034,000 9,034,000 9,034,000 9,034,000 8,599,000 8,553,000 5,162,000 5,162,000 5,162,000 5,162,000 5,162,000 5,162,000 5,162,000 5,162,000 5,162,000 5,162,000 5,162,000 5,162,000 5,162,000 5,162,000 5,162,000 5,162,000 5,162,000 5,162,000 5,162,000 5,162,000 5,162,000 
  trademarks, trade names and patents, net of accumulated amortization of 664 and 625 at april 30, 2025 and july 31, 2024, respectively6,620,000                                                                   
  customer list, net of accumulated amortization of 8,996 and 8,149 at april 30, 2025 and july 31, 2024, respectively19,189,000                                                                   
  deferred income taxes1,909,000 1,683,000 1,075,000 1,537,000 7,117,000 6,820,000 7,028,000 7,201,000 4,022,000 3,511,000 3,509,000 3,677,000 3,410,000 2,066,000 1,895,000 2,096,000 6,574,000 6,554,000 6,587,000 7,302,000 6,397,000 7,445,000 7,786,000 7,755,000 7,013,000 7,013,000 6,902,000 7,349,000 8,272,000 9,106,000 14,172,000 2,787,000 3,884,000 3,884,000 3,884,000 3,884,000 2,468,000 2,468,000 2,468,000 2,468,000 1,570,000 1,570,000 1,570,000 1,570,000 3,539,000 3,540,000 3,986,000 3,986,000 2,611,000 2,611,000 2,611,000 2,611,000 1,193,000 1,193,000 1,193,000 1,193,000 2,867,000 2,867,000 2,867,000 1,080,000 1,080,000 1,722,000 1,722,000 1,647,000 1,647,000 1,647,000 1,647,000 
  operating lease right-of-use assets15,236,000 16,417,000 17,552,000 18,667,000 12,981,000 12,649,000 8,944,000 9,386,000 9,433,000 9,460,000 10,027,000 10,601,000 9,934,000 10,570,000 8,110,000 8,619,000 9,128,000 8,741,000 9,227,000 9,816,000 8,327,000 8,535,000 8,967,000                                             
  other7,581,000 7,408,000 7,422,000 7,306,000 7,186,000 7,151,000 7,769,000 7,230,000 6,546,000 6,612,000 6,365,000 7,546,000 6,836,000 6,588,000 6,199,000 7,500,000 7,268,000 6,836,000 6,557,000 5,670,000 5,152,000 5,087,000 5,084,000 5,049,000 5,275,000 5,204,000 4,921,000 4,886,000 4,979,000 4,937,000 6,336,000 6,475,000 6,555,000 6,192,000 5,940,000 5,902,000 6,152,000 6,041,000 6,042,000 6,013,000 6,232,000 6,864,000 7,126,000 6,232,000 5,884,000 5,534,000 6,322,000 5,538,000 4,800,000 4,640,000 4,636,000 4,638,000 4,623,000 4,467,000 4,442,000 4,350,000 4,379,000 4,233,000 4,178,000 4,141,000 4,281,000 4,207,000 4,167,000 4,300,000 4,252,000 4,192,000 4,163,000 
  total other assets206,117,000 204,731,000 206,056,000 69,651,000 32,360,000 31,692,000 28,786,000 28,856,000 25,103,000 24,777,000 25,122,000 27,064,000 25,520,000 30,599,000 27,627,000 29,684,000 34,566,000 33,757,000 34,048,000 34,514,000 31,735,000 33,067,000 33,991,000 25,153,000 24,584,000 24,644,000 24,394,000 24,962,000 26,071,000 27,092,000 33,765,000 31,525,000 32,433,000 32,298,000 32,380,000 33,049,000 26,715,000 26,886,000 27,168,000 27,733,000 26,388,000 27,584,000 28,154,000 27,792,000 24,911,000 25,548,000 14,657,000 14,132,000 15,675,000 14,124,000 14,299,000 14,612,000 13,396,000 13,311,000 13,354,000 13,549,000 15,308,000 15,364,000 15,205,000 15,282,000 15,835,000 12,615,000 12,640,000 12,990,000 12,916,000 12,564,000 12,577,000 
  total assets369,543,000 353,747,000 350,171,000 354,605,000 319,152,000 296,152,000 288,768,000 286,235,000 270,296,000 256,044,000 249,113,000 249,611,000 241,452,000 247,214,000 223,888,000 227,566,000 229,634,000 228,197,000 227,371,000 235,882,000 215,981,000 209,079,000 209,742,000 205,227,000 198,478,000 193,137,000 196,951,000 194,682,000 198,010,000 205,535,000 206,917,000 212,575,000 212,053,000 206,574,000 200,067,000 204,933,000 196,149,000 199,055,000 192,086,000 190,031,000 185,426,000 184,314,000 180,727,000 186,204,000 184,637,000 183,860,000 178,429,000 183,559,000 180,854,000 176,418,000 174,708,000 174,267,000 171,938,000 174,222,000 172,518,000 173,393,000 171,359,000 172,061,000 151,343,000 153,539,000 149,126,000 140,535,000 138,245,000 139,110,000 143,142,000 126,588,000 123,571,000 
  liabilities & stockholders’ equity                                                            2,009,000       
  current liabilities                                                                   
  current maturities of notes payable1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000    3,083,000 3,083,000 3,083,000 3,083,000 3,083,000 3,083,000 3,083,000 3,083,000 3,083,000 3,083,000 3,083,000 3,083,000 3,083,000 3,083,000 3,083,000 3,083,000 3,483,000 3,483,000 3,483,000 3,483,000 3,500,000 3,500,000 3,500,000 3,500,000 3,500,000 3,500,000 5,000,000 5,000,000 3,800,000 3,800,000 3,800,000 3,800,000 3,600,000 3,600,000 4,100,000 4,100,000 3,500,000 4,500,000 4,080,000 4,080,000 4,080,000 3,080,000 3,080,000 3,080,000 
  accounts payable13,177,000 14,004,000 13,824,000 15,009,000 13,728,000 12,009,000 14,867,000 17,101,000 11,919,000 11,048,000 12,088,000 13,401,000 10,099,000 10,145,000 10,173,000 9,206,000 6,912,000 7,276,000 9,745,000 12,529,000 10,524,000 9,565,000 7,942,000 8,092,000 8,608,000 7,882,000 13,287,000 6,543,000 7,747,000 8,089,000 7,828,000 9,594,000 8,105,000 7,316,000 6,910,000 6,635,000 6,002,000 7,704,000 7,561,000 7,428,000 6,165,000 6,191,000 5,599,000 7,352,000 7,102,000 7,699,000 6,907,000 6,483,000 6,742,000 6,172,000 6,551,000 6,700,000 6,576,000 6,034,000 6,621,000 6,369,000 7,612,000 7,687,000 6,424,000 5,974,000 4,500,000 6,184,000 6,215,000 5,884,000 6,158,000 6,476,000 5,228,000 
  dividends payable2,105,000 2,097,000 2,098,000 2,096,000 1,958,000 1,963,000 1,953,000 1,927,000 1,863,000 1,858,000 1,860,000 1,851,000 1,845,000 1,845,000 1,864,000 1,865,000 1,795,000 1,799,000 1,807,000 1,808,000 1,735,000 1,766,000 1,766,000 1,761,000 1,689,000 1,680,000 1,656,000 1,627,000 1,559,000 1,559,000 1,559,000 1,553,000 1,485,000 1,485,000 1,479,000 1,477,000 1,407,000 1,407,000 1,406,000 1,376,000 1,310,000 1,313,000 1,313,000 1,311,000 1,243,000 1,242,000 1,242,000 1,236,000   1,156,000 1,154,000 1,134,000 1,132,000 1,132,000 1,129,000 1,059,000 1,059,000 1,061,000 1,003,000 996,000 758,000 755,000 607,000 608,000 608,000 559,000 
  operating lease liabilities4,167,000 4,357,000 4,476,000 4,556,000 2,819,000 2,637,000 1,872,000 1,872,000 1,810,000 1,850,000 2,008,000 2,178,000 1,766,000 2,080,000 1,723,000 2,036,000 2,252,000 2,043,000 2,066,000 2,170,000 1,561,000 1,461,000 1,603,000                                             
  accrued expenses37,207,000 30,732,000 33,443,000 44,016,000 32,413,000 28,554,000 32,613,000 36,868,000 35,312,000 33,785,000 28,336,000 30,085,000 26,697,000 23,802,000 23,746,000 24,883,000 23,950,000 22,811,000 19,852,000                                                 
  total current liabilities57,656,000 52,190,000 54,841,000 66,677,000 51,918,000 46,163,000 52,305,000 58,768,000 51,904,000 49,541,000 45,292,000 48,515,000 41,407,000 38,872,000 38,506,000 38,990,000 35,909,000 34,929,000 34,470,000 46,207,000 40,947,000 33,505,000 30,002,000 32,606,000 31,501,000 31,089,000 35,717,000 30,949,000 35,719,000 33,334,000 27,747,000 32,954,000 32,771,000 29,498,000 27,327,000 30,740,000 30,647,000 32,154,000 28,744,000 28,888,000 28,729,000 27,720,000 25,943,000 29,500,000 29,794,000 29,127,000 27,314,000 31,447,000 30,263,000 29,395,000 28,660,000 29,122,000 27,213,000 26,250,000 27,474,000 26,480,000 27,408,000 27,349,000 25,521,000 26,476,000 23,101,000 25,610,000 25,569,000 24,365,000 24,797,000 24,758,000 22,534,000 
  noncurrent liabilities                                                                   
  long-term debt, net of unamortized debt issuance costs of 193 and 226 at april 30, 2025 and july 31, 2024, respectively39,807,000                                                                   
  deferred compensation6,215,000 5,956,000 5,664,000 5,667,000 5,508,000 5,423,000 5,024,000 4,512,000 4,436,000 4,441,000 4,159,000 4,559,000 4,926,000 5,060,000 4,612,000 4,370,000 5,742,000 5,725,000 5,310,000 5,140,000 4,847,000 4,881,000 6,155,000 6,014,000 5,679,000 5,664,000 6,298,000 6,100,000 6,266,000 5,996,000 11,867,000 11,537,000 11,022,000 10,991,000 10,778,000 10,504,000 9,657,000 9,622,000 9,604,000 9,518,000 9,745,000 9,624,000 9,528,000 9,267,000 9,137,000 8,976,000 8,820,000 8,569,000 8,450,000 8,398,000 8,326,000 8,117,000 7,444,000 7,312,000 7,115,000 7,196,000 6,904,000 6,789,000 6,639,000 6,503,000 6,102,000 4,182,000 4,109,000 3,845,000 3,737,000 3,687,000 3,650,000 
  long-term operating lease liabilities12,239,000 13,261,000 14,294,000 15,391,000 11,399,000 11,251,000 8,345,000 8,810,000 8,920,000 8,919,000 9,334,000 9,749,000 9,552,000 9,892,000 7,807,000 8,022,000 8,327,000 8,165,000 8,636,000 9,135,000 8,285,000 8,602,000 8,906,000                                             
  total noncurrent liabilities65,028,000 65,697,000 71,338,000 77,340,000 64,285,000 53,951,000 50,547,000 50,391,000 51,297,000 49,529,000 49,793,000 50,747,000 54,290,000 55,051,000 29,081,000 29,344,000 40,786,000 40,827,000 42,585,000 41,711,000 28,379,000 28,645,000 41,804,000 37,075,000 29,462,000 29,284,000 29,447,000 31,848,000 33,278,000 45,939,000 51,060,000 53,584,000 56,494,000 56,571,000 55,966,000 58,642,000 48,951,000 48,830,000 48,116,000 50,615,000 49,327,000 49,667,000 49,437,000 52,396,000 46,851,000 46,675,000 46,245,000 49,174,000 57,141,000 57,182,000 57,010,000 59,837,000 48,306,000 50,233,000 49,664,000 51,615,000 50,557,000 52,838,000 33,671,000 33,321,000 35,061,000 39,690,000 39,375,000 38,898,000 43,010,000 27,690,000 27,183,000 
  total liabilities122,684,000 117,887,000 126,179,000 144,017,000 116,203,000 100,114,000 102,852,000 109,159,000 103,201,000 99,070,000 95,085,000 99,262,000 95,697,000 93,923,000 67,587,000 68,334,000 76,695,000 75,756,000 77,055,000 87,918,000 69,326,000 62,150,000 71,806,000 69,681,000 60,963,000 60,373,000 65,164,000 62,797,000 68,997,000 79,273,000 78,807,000 86,538,000 89,265,000 86,069,000 83,293,000 89,382,000 79,598,000 80,984,000 76,860,000 79,503,000 78,056,000 77,387,000 75,380,000 81,896,000 76,645,000 75,802,000 73,559,000 80,621,000 87,404,000 86,577,000 85,670,000 88,959,000 75,519,000 76,483,000 77,138,000 78,095,000 77,965,000 80,187,000 59,192,000 59,797,000 58,162,000 65,300,000 64,944,000 63,263,000 67,807,000 52,448,000 49,717,000 
  commitments and contingencies                                                                   
  stockholders’ equity                                                                   
  common stock1,527,000 1,522,000 888,000 884,000 883,000 882,000 881,000 875,000 874,000 874,000 872,000 868,000 868,000 867,000 863,000 856,000 854,000 853,000 851,000 845,000 837,000 835,000 835,000 828,000 828,000 823,000 814,000 809,000 805,000 805,000 804,000 802,000 802,000 802,000 800,000 798,000 798,000 798,000 797,000 794,000 793,000 793,000 793,000 792,000 792,000 789,000 789,000 787,000 784,000 783,000 779,000 779,000 777,000 777,000 776,000 775,000 773,000    748,000 722,000 716,000 625,000 602,000 599,000 597,000 
  class b stock, par value .10 per share, issued 4,650,484 shares at april 30, 2025 and 4,652,984 shares at july 31, 2024465,000                                                                   
  additional paid-in capital64,536,000 63,195,000 62,601,000 60,877,000 59,449,000 58,205,000 56,746,000 55,624,000 55,488,000 54,328,000 53,385,000 52,467,000 51,117,000 50,220,000 49,377,000 48,271,000 47,591,000 46,890,000 45,779,000 44,993,000 44,149,000 43,149,000 42,327,000 41,300,000 40,487,000 39,730,000 39,186,000 38,473,000 38,022,000 37,253,000 36,775,000 36,242,000 35,676,000 35,288,000 34,853,000 34,294,000 33,809,000 33,460,000 37,622,000 33,563,000 33,518,000 33,467,000 33,403,000 33,130,000 33,095,000 32,446,000 32,439,000 31,317,000 31,059,000 30,691,000 29,998,000 29,759,000 29,570,000 29,363,000 29,303,000 29,213,000 29,028,000 28,482,000 28,238,000 24,851,000 23,516,000 19,052,000 18,317,000 18,223,000 14,742,000 14,164,000 13,871,000 
  retained earnings266,889,000 257,349,000 246,525,000 232,247,000 225,818,000 219,995,000 209,585,000 200,796,000 190,800,000 184,133,000 182,135,000 178,754,000 175,368,000 179,322,000 179,164,000 180,443,000 181,703,000 181,265,000 178,761,000 176,579,000 172,504,000 169,590,000 166,526,000 164,756,000 162,718,000 158,788,000 158,185,000 158,935,000 157,862,000 153,571,000 156,226,000 154,735,000 154,966,000 153,240,000 150,475,000 149,945,000 146,195,000 148,493,000 146,080,000 142,095,000 138,405,000 138,330,000 136,846,000 136,039,000 136,901,000 137,422,000 134,382,000 132,750,000 129,248,000 125,997,000 126,196,000 122,901,000 124,119,000 123,363,000 121,256,000 121,388,000 119,624,000 118,819,000 118,198,000 115,579,000 112,790,000 98,252,000 97,047,000 97,023,000 96,437,000 95,311,000 94,891,000 
  accumulated other comprehensive income751,000 561,000 727,000 769,000 698,000 733,000 563,000                                                             
  less treasury stock, at cost-87,309,000 -87,232,000 -87,001,000 -84,441,000 -84,151,000 -84,029,000 -82,111,000 -81,207,000 -80,354,000 -79,886,000 -79,648,000 -79,428,000 -77,251,000 -72,862,000 -68,922,000 -66,154,000 -65,948,000 -65,071,000 -63,253,000 -62,269,000 -61,322,000 -57,138,000 -57,103,000 -56,543,000 -56,537,000 -56,480,000 -56,154,000 -55,946,000 -55,931,000 -55,813,000 -55,761,000 -55,701,000 -55,701,000 -55,681,000 -55,838,000 -55,716,000 -55,857,000 -55,845,000 -55,789,000 -55,987,000 -55,970,000 -55,451,000 -55,451,000 -55,404,000 -55,395,000 -55,344,000 -55,332,000 -55,296,000 -55,296,000 -55,276,000 -55,217,000 -55,208,000 -51,442,000 -49,268,000 -49,268,000 -49,424,000 -49,424,000    -41,722,000 -42,082,000 -42,082,000 -39,080,000 -36,704,000 -35,980,000 -35,366,000 
  total stockholders’ equity246,859,000 235,860,000 223,992,000 210,588,000 202,949,000 196,038,000 185,916,000 177,076,000 167,095,000 156,974,000 154,028,000 150,349,000 145,755,000 153,291,000 156,301,000 159,232,000 152,939,000 152,441,000 150,316,000 147,964,000 146,655,000 146,929,000 137,936,000 135,546,000 137,515,000 132,764,000 131,787,000 131,885,000 129,013,000 126,262,000 128,110,000 126,037,000 122,788,000 120,505,000 116,774,000 115,551,000 116,551,000 118,071,000 115,226,000 110,528,000 107,370,000 106,927,000 105,347,000 104,308,000 107,992,000 108,058,000 104,870,000 102,938,000 93,450,000 89,841,000 89,038,000 85,308,000 96,419,000 97,739,000 95,380,000 95,298,000 93,394,000 91,874,000 92,151,000 93,742,000 90,964,000 75,235,000 73,301,000 75,847,000 75,335,000 74,140,000 73,854,000 
  total liabilities & stockholders’ equity369,543,000 353,747,000 350,171,000  319,152,000 296,152,000 288,768,000  270,296,000 256,044,000 249,113,000  241,452,000 247,214,000 223,888,000  229,634,000 228,197,000 227,371,000  215,981,000 209,079,000 209,742,000  198,478,000 193,137,000 196,951,000  198,010,000 205,535,000 206,917,000  212,053,000 206,574,000 200,067,000  196,149,000 199,055,000 192,086,000  185,426,000 184,314,000 180,727,000  184,637,000 183,860,000 178,429,000  180,854,000 176,418,000 174,708,000  171,938,000 174,222,000 172,518,000  171,359,000 172,061,000 151,343,000 153,539,000 149,126,000 140,535,000 138,245,000 139,110,000 143,142,000 126,588,000  
  trademarks, trade names and patents, net of accumulated amortization of 653 and 625 at january 31, 2025 and july 31, 2024, respectively 6,630,000                                                                  
  customer list, net of accumulated amortization of 8,713 and 8,149 at january 31, 2025 and july 31, 2024, respectively 19,471,000                                                                  
  long-term debt, net of unamortized debt issuance costs of 204 and 226 at january 31, 2025 and july 31, 2024, respectively 39,796,000                                                                  
  class b stock, par value .10 per share, issued 4,650,484 shares at january 31, 2025 and 4,652,984 shares at july 31, 2024 465,000                                                                  
  trademarks, trade names and patents, net of accumulated amortization of 647 and 625 at october 31, 2024 and july 31, 2024, respectively  6,632,000                                                                 
  customer list, net of accumulated amortization of 8,431 and 8,149 at october 31, 2024 and july 31, 2024, respectively  19,754,000                                                                 
  long-term debt, net of unamortized debt issuance costs of 223 and 226 at october 31, 2024 and july 31, 2024, respectively  44,777,000                                                                 
  class b stock, par value .10 per share, issued 2,518,056 shares at october 31, 2024 and 2,518,056 shares at july 31, 2024  252,000                                                                 
  assets                                                                   
  accounts receivables   62,171,000    59,287,000   53,062,000 51,683,000 43,287,000 45,970,000 43,082,000 40,923,000 39,088,000 38,896,000 39,212,000 34,911,000 41,846,000 35,699,000 36,269,000 35,459,000 35,906,000 38,282,000 39,935,000 33,602,000 32,566,000 32,309,000 32,054,000 32,750,000 31,969,000 32,047,000 30,971,000 30,386,000 29,161,000 30,708,000 31,889,000 31,466,000 31,965,000 32,255,000 31,893,000 30,997,000 32,854,000 37,022,000 31,732,000 31,148,000 29,784,000 31,004,000 31,381,000 30,225,000 30,495,000 28,907,000 31,294,000 29,217,000 26,269,000 26,976,000   25,569,000 26,920,000 26,009,000 25,711,000 28,165,000 24,086,000 23,611,000 
  land   13,550,000                                            16,266,000    16,275,000    16,147,000           10,278,000 
  buildings and leasehold improvements   41,648,000    40,940,000    40,294,000    40,181,000    39,274,000    38,852,000    38,534,000    37,284,000    36,776,000    28,518,000    28,557,000    28,475,000    28,338,000    27,642,000           22,667,000 
  machinery and equipment   192,788,000    184,471,000    165,350,000    162,930,000    152,583,000    145,402,000    141,530,000    136,900,000    137,479,000    127,399,000    120,081,000    112,056,000    109,181,000    115,978,000           95,335,000 
  office furniture and equipment   22,530,000    18,744,000    17,524,000    21,685,000    21,502,000    20,569,000    11,089,000    10,356,000    10,986,000    10,689,000    10,244,000    9,880,000    9,720,000    9,993,000           11,130,000 
  vehicles   24,617,000    17,663,000    15,470,000    17,543,000    17,863,000    15,375,000    14,151,000    13,615,000    13,108,000    12,330,000    12,099,000    11,615,000    10,621,000    10,570,000           5,292,000 
  construction in progress   20,974,000    15,856,000    24,496,000    14,627,000    13,717,000    12,519,000    13,985,000    9,649,000    2,831,000    14,188,000    11,759,000    5,845,000    2,572,000    8,949,000           4,769,000 
  mining assets   9,966,000                                                                
  capital parts   7,488,000    3,292,000                                                            
  less accumulated depreciation and amortization   -195,765,000 -194,580,000 -190,881,000 -185,348,000 -182,999,000 -180,071,000 -180,936,000 -177,891,000 -175,374,000 -174,166,000 -173,119,000 -181,968,000 -178,885,000 -176,933,000 -174,060,000 -171,287,000 -169,040,000 -166,990,000 -164,096,000 -161,164,000 -159,036,000 -157,292,000 -155,232,000 -152,441,000 -149,385,000 -147,871,000 -145,668,000 -142,826,000 -140,411,000 -138,172,000 -135,861,000 -139,476,000 -137,314,000 -136,234,000 -133,597,000 -132,210,000 -129,929,000 -128,459,000 -126,380,000 -125,608,000 -124,199,000 -122,246,000 -119,956,000 -119,840,000 -118,082,000 -117,161,000 -115,350,000 -114,255,000 -112,254,000 -111,840,000 -110,443,000 -122,961,000 -121,251,000 -119,954,000 -118,203,000 -116,795,000 -113,892,000 -111,099,000 -98,661,000 -108,899,000 -106,287,000 -104,824,000 -103,312,000 -101,573,000 
  total property, plant and equipment   137,796,000 127,946,000 125,027,000 123,216,000 120,872,000 111,128,000 111,679,000 109,655,000 107,866,000 102,230,000 99,861,000 98,757,000 95,940,000 91,198,000 91,653,000 91,038,000 92,948,000 90,133,000 89,831,000 90,206,000 90,798,000 87,086,000 86,193,000 87,338,000 86,706,000 84,807,000 84,289,000 84,251,000 84,033,000 81,543,000 81,498,000 81,688,000 80,711,000 79,489,000 79,449,000 78,801,000 79,655,000 80,547,000 79,702,000 78,212,000 74,896,000 71,969,000 68,959,000 67,230,000 66,055,000 65,758,000 65,117,000 64,412,000 64,453,000 66,378,000 66,810,000 67,285,000 68,028,000 66,535,000 63,045,000 62,091,000 61,865,000 58,995,000 51,313,000 51,880,000 48,739,000 48,618,000 48,702,000 47,898,000 
  trademarks, trade names and patents, net of accumulated amortization of 625 and 578 in 2024 and 2023, respectively   6,662,000                                                                
  customer list, net of accumulated amortization of 8,149 and 7,763 in 2024 and 2023, respectively   20,036,000                                                                
  liabilities and stockholders’ equity                                                                   
  long-term debt, net of unamortized debt issuance costs of 226 and 173 in 2024 and 2023, respectively   49,774,000                                                                
  class b stock, convertible, par value .10 per share, issued 2,518,056 shares in 2024 and 2,397,056 shares in 2023   252,000                                                                
  total liabilities and stockholders’ equity   354,605,000    286,235,000    249,611,000    227,566,000    235,882,000    205,227,000    194,682,000    212,575,000    204,933,000    190,031,000    186,204,000    183,559,000    174,267,000    173,393,000           123,571,000 
  prepaid expenses    6,554,000 6,067,000 2,692,000                                                             
  cost    322,526,000 315,908,000 308,564,000  291,199,000 292,615,000 287,546,000  276,396,000 272,980,000 280,725,000  268,131,000 265,713,000 262,325,000  257,123,000 253,927,000 251,370,000  244,378,000 241,425,000 239,779,000  232,678,000 229,957,000 227,077,000  219,715,000 217,359,000 221,164,000  215,723,000 213,046,000 211,011,000  209,006,000 206,082,000 203,820,000  194,215,000 188,915,000 187,070,000  182,919,000 180,467,000 178,667,000  178,218,000 177,253,000 190,246,000  186,489,000 181,248,000 178,886,000 175,757,000 170,094,000 149,974,000 160,779,000 155,026,000 153,442,000 152,014,000  
  intangible assets, net of accumulated amortization of 8,394 and 8,341 at april 30, 2024 and july 31, 2023, respectively    1,458,000                                                               
  notes payable, net of unamortized debt issuance costs of 140 and 173 at april 30, 2024 and july 31, 2023, respectively    40,860,000                                                               
  class b stock, par value .10 per share, issued 2,518,056 shares at april 30, 2024 and 2,397,056 shares at july 31, 2023    252,000                                                               
  accounts receivable, net allowances of 1,072 and 1,087 at january 31, 2024 and july 31, 2023, respectively     59,336,000                                                              
  intangible assets, net of accumulated amortization of 8,383 and 8,341 at january 31, 2024 and july 31, 2023, respectively     1,454,000                                                              
  notes payable, net of unamortized debt issuance costs of 149 and 173 at january 31, 2024 and july 31, 2023, respectively     30,851,000                                                              
  class b stock, par value .10 per share, issued 2,524,556 shares at january 31, 2024 and 2,397,056 shares at july 31, 2023     252,000                                                              
  accounts receivable, net allowances of 1,115 and 1,087 at october 31, 2023 and july 31, 2023, respectively      60,663,000                                                             
  trademarks and patents, net of accumulated amortization of 581 and 578 at october 31, 2023 and july 31, 2023, respectively      1,427,000                                                             
  customer list, net of accumulated amortization of 7,785 and 7,763 at october 31, 2023 and july 31, 2023, respectively                                                                   
  notes payable, net of unamortized debt issuance costs of 158 and 173 at october 31, 2023 and july 31, 2023, respectively      30,842,000                                                             
  class b stock, par value .10 per share, issued 2,522,056 shares at october 31, 2023 and 2,397,056 shares at july 31, 2023      252,000                                                             
  gross depreciable assets       261,818,000    238,638,000    242,339,000    231,222,000    220,198,000    205,304,000    198,155,000    198,349,000    178,936,000    170,981,000    162,026,000    157,860,000                
  net depreciable assets       78,819,000    63,264,000    63,454,000    62,182,000    61,162,000    55,919,000    57,744,000    61,035,000    49,007,000    46,782,000    43,944,000    45,606,000                
  land and mineral rights       22,905,000    20,106,000    17,859,000    17,049,000    17,117,000    16,802,000    16,640,000    16,845,000    16,460,000    16,355,000                        
  trademarks and patents, net of accumulated amortization of 578 and 524 in 2023 and 2022, respectively       1,399,000                                                            
  customer list, net of accumulated amortization of 7,763 and 7,608 in 2023 and 2022, respectively       22,000                                                            
  notes payable, net of unamortized debt issuance costs of 173 and 202 in 2023 and 2022, respectively       30,827,000                                                            
  pension and postretirement benefits       1,753,000 2,164,000 434,000 616,000 798,000 3,919,000 4,253,000 4,592,000 4,922,000 13,990,000 14,374,000 15,184,000 15,140,000 12,565,000 12,637,000 24,071,000 23,721,000 16,756,000 16,474,000 16,218,000 15,906,000 17,282,000 29,392,000 29,314,000 29,161,000 32,758,000 32,915,000 32,687,000 32,492,000 23,729,000 23,675,000 23,683,000 23,429,000 22,129,000 22,600,000 22,531,000 22,273,000 16,822,000 16,778,000 16,582,000 16,362,000 24,740,000 24,823,000 24,764,000 24,241,000 13,419,000 14,070,000 13,678,000 13,235,000 12,543,000 13,402,000 12,947,000 10,736,000 10,901,000       
  class b stock, convertible, par value .10 per share, issued 2,397,056 shares in 2023 and 2,397,056 shares in 2022       240,000                                                            
  noncontrolling interest        -437,000 -390,000 -380,000 -369,000 -362,000 -338,000 -297,000 -307,000 -261,000 -220,000 -209,000 -174,000 -169,000 -171,000 -90,000 -14,000 -53,000 5,000 11,000 -18,000                                        
  cumulative translation adjustment       -264,000 -221,000 -70,000 -326,000 59,000 124,000 217,000 277,000 311,000 260,000 148,000 12,000 -260,000 -378,000 -246,000 -192,000 -148,000 -238,000 -267,000 -295,000 -231,000 -60,000 105,000 -39,000 35,000 -206,000 -106,000 -169,000 -155,000 -128,000 -420,000 -281,000 -270,000 -48,000 -182,000 170,000 255,000 248,000 193,000 420,000 487,000 554,000 595,000 588,000 573,000 641,000 572,000 606,000 799,000 817,000 598,000 517,000 555,000 269,000 151,000 253,000 208,000 92,000 -93,000 -282,000 
  total accumulated other comprehensive income       748,000 484,000                                   -8,263,000   -5,053,000                     
  accounts receivable, net allowances of 1,071 and 922 at april 30, 2023 and july 31, 2022, respectively        56,983,000                                                           
  prepaid repairs        8,470,000 8,107,000 8,019,000  6,150,000 6,454,000                                                      
  trademarks and patents, net of accumulated amortization of 570 and 524 at april 30, 2023 and july 31, 2022, respectively        1,423,000                                                           
  customer list, net of accumulated amortization of 7,724 and 7,608 at april 30, 2023 and july 31, 2022, respectively        61,000                                                           
  notes payable, net of unamortized debt issuance costs of 182 and 202 at april 30, 2023 and july 31, 2022, respectively        31,818,000                                                           
  class b stock, par value .10 per share, issued 2,397,056 shares at april 30, 2023 and 2,397,056 shares at july 31, 2022        240,000                                                           
  accumulated other comprehensive loss:                                                                   
  pension and postretirement obligation        705,000                                                           
  accounts receivable, net allowances of 1,037 and 922 at january 31, 2023 and july 31, 2022, respectively         57,179,000                                                          
  trademarks and patents, net of accumulated amortization of 550 and 524 at january 31, 2023 and july 31, 2022, respectively         1,476,000                                                          
  customer list, net of accumulated amortization of 7,685 and 7,608 at january 31, 2023 and july 31, 2022, respectively         100,000                                                          
  notes payable, net of unamortized debt issuance costs of 191 and 202 at january 31, 2023 and july 31, 2022, respectively         31,809,000                                                          
  class b stock, par value .10 per share, issued 2,397,056 shares at january 31, 2023 and 2,397,056 shares at july 31, 2022         240,000                                                          
  total accumulated other comprehensive loss         -2,325,000 -2,576,000 -2,183,000 -4,225,000 -4,158,000 -4,124,000 -4,117,000 -11,240,000 -11,517,000 -11,854,000 -12,254,000 -9,595,000 -9,589,000 -14,812,000 -15,039,000 -10,185,000 -10,360,000 -10,512,000 -10,615,000 -11,995,000 -9,804,000 -10,185,000 -10,292,000 -13,206,000 -13,395,000 -13,767,000 -14,022,000 -8,646,000 -9,087,000 -9,078,000 -9,245,000 -8,392,000 -8,622,000 -8,363,000  -5,068,000 -5,218,000                      
  trademarks and patents, net of accumulated amortization of 527 and 524 at october 31, 2022 and july 31, 2022, respectively          1,465,000                                                         
  customer list, net of accumulated amortization of 7,647 and 7,608 at october 31, 2022 and july 31, 2022, respectively          138,000                                                         
  notes payable, net of unamortized debt issuance costs of 200 and 202 at october 31, 2022 and july 31, 2022, respectively          31,800,000                                                         
  class b stock, par value .10 per share, issued 2,397,056 shares at october 31, 2022 and 2,397,056 shares at july 31, 2022          240,000                                                         
  prepaid repairs expense           7,474,000   5,964,000 6,088,000 5,893,000 5,808,000 6,106,000 5,662,000 5,163,000 4,679,000 4,662,000 4,708,000 4,110,000 4,116,000 4,259,000 4,111,000 3,839,000 3,827,000 3,864,000 3,890,000 3,905,000 4,054,000 4,235,000 3,938,000 3,923,000 3,791,000 3,960,000 3,813,000 3,738,000 3,618,000 3,585,000 3,722,000 3,558,000 3,288,000 3,265,000 3,458,000 3,429,000 3,305,000 3,518,000 3,549,000 3,952,000 3,828,000 3,744,000 3,782,000 3,651,000 3,684,000 3,781,000 3,926,000 4,173,000       
  trademarks and patents, net of accumulated amortization of 524 and 385 in 2022 and 2021, respectively           1,445,000                                                        
  customer list, net of accumulated amortization of 7,608 and 7,321 in 2022 and 2021, respectively           177,000                                                        
  notes payable, net of unamortized debt issuance costs of 202 and 122 in 2022 and 2021, respectively           31,798,000                                                        
  class b stock, convertible, par value .10 per share, issued 2,397,056 shares in 2022 and 2,397,056 shares in 2021           240,000                                                        
  accumulated other comprehensive loss                                                                   
  other intangibles, net of accumulated amortization of 497 and 385 at april 30, 2022 and july 31, 2021, respectively            1,473,000                                                       
  customer list, net of accumulated amortization of 7,536 and 7,321 at april 30, 2022 and july 31, 2021, respectively            249,000                                                       
  notes payable, net of unamortized debt issuance costs of 212 and 122 at april 30, 2022 and july 31, 2021, respectively            32,788,000                                                       
  class b stock, par value .10 per share, issued 2,397,056 shares at april 30, 2022 and 2,397,056 shares at july 31, 2021            240,000                                                       
  other intangibles, net of accumulated amortization of 471 and 385 at january 31, 2022 and july 31, 2021, respectively             1,792,000                                                      
  customer list, net of accumulated amortization of 7,464 and 7,321 at january 31, 2022 and july 31, 2021, respectively             321,000                                                      
  notes payable, net of unamortized debt issuance costs of 222 and 122 at january 31, 2022 and july 31, 2021, respectively             32,778,000                                                      
  class b stock, par value .10 per share, issued 2,397,056 shares at january 31, 2022 and 2,397,056 shares at july 31, 2021             240,000                                                      
  other intangibles, net of accumulated amortization of 421 and 385 at october 31, 2021 and july 31, 2021, respectively              1,768,000                                                     
  customer list, net of accumulated amortization of 7,392 and 7,321 at october 31, 2021 and july 31, 2021, respectively              393,000                                                     
  notes payable, net of unamortized debt issuance costs of 116 and 122 at october 31, 2021 and july 31, 2021, respectively              7,884,000                                                     
  class b stock, par value .10 per share, issued 2,397,056 shares at october 31, 2021 and 2,397,056 shares at july 31, 2021              240,000                                                     
  trademarks and patents, net of accumulated amortization of 385 and 457 in 2021 and 2020, respectively               1,743,000                                                    
  customer list, net of accumulated amortization of 7,321 and 6,887 in 2021 and 2020, respectively               464,000                                                    
  notes payable, net of unamortized debt issuance costs of 122 and 150 in 2021 and 2020, respectively               7,878,000                                                    
  class b stock, convertible, par value .10 per share, issued 2,397,056 shares in 2021 and 2,437,402 shares in 2020               240,000                                                    
  other intangibles, net of accumulated amortization of 540 and 457 at april 30, 2021 and july 31, 2020, respectively                1,761,000                                                   
  customer list, net of accumulated amortization of 7,212 and 6,887 at april 30, 2021 and july 31, 2020, respectively                573,000                                                   
  notes payable, net of unamortized debt issuance costs of 129 and 150 at april 30, 2021 and july 31, 2020, respectively                8,871,000                                                   
  class b stock, par value .10 per share, issued 2,397,056 shares at april 30, 2021 and 2,437,402 shares at july 31, 2020                240,000                                                   
  other intangibles, net of accumulated amortization of 518 and 457 at january 31, 2021 and july 31, 2020, respectively                 1,683,000                                                  
  customer list, net of accumulated amortization of 7,104 and 6,887 at january 31, 2021 and july 31, 2020, respectively                 681,000                                                  
  notes payable, net of unamortized debt issuance costs of 136 and 150 at january 31, 2021 and july 31, 2020, respectively                 8,864,000                                                  
  class b stock, par value .10 per share, issued 2,413,141 shares at january 31, 2021 and 2,437,402 shares at july 31, 2020                 241,000                                                  
  other intangibles, net of accumulated amortization of 483 and 457 at october 31, 2020 and july 31, 2020, respectively                  1,625,000                                                 
  customer list, net of accumulated amortization of 6,995 and 6,887 at october 31, 2020 and july 31, 2020, respectively                  790,000                                                 
  notes payable, net of unamortized debt issuance costs of 143 and 150 at october 31, 2020 and july 31, 2020, respectively                  8,857,000                                                 
  class b stock, par value .10 per share, issued 2,413,141 shares at october 31, 2020 and 2,437,402 shares at july 31, 2020                  241,000                                                 
  trademarks and patents, net of accumulated amortization of 457 and 299 in 2020 and 2019, respectively                   1,566,000                                                
  customer list, net of accumulated amortization of 6,887 and 6,297 in 2020 and 2019, respectively                   898,000                                                
  salaries, wages and commissions                   13,505,000 10,559,000 7,446,000 4,724,000 6,740,000 6,487,000 4,518,000 4,278,000 8,974,000 7,886,000 5,724,000 4,735,000 7,917,000 7,409,000 6,675,000 4,263,000 8,656,000 9,254,000 8,662,000 6,187,000 6,245,000 5,203,000 4,470,000 3,527,000 4,448,000 3,963,000 4,674,000 3,526,000 9,087,000 8,793,000 6,423,000 4,708,000 6,201,000 5,363,000 4,697,000 3,551,000 4,143,000 4,665,000 4,248,000 4,029,000 6,291,000 4,097,000 4,104,000 3,292,000 3,363,000 3,139,000 2,527,000 3,741,000 
  trade promotions and advertising                   2,349,000 1,853,000 1,387,000 1,198,000 1,588,000 864,000 1,132,000 860,000 1,280,000 1,052,000 1,074,000 1,748,000 2,253,000 2,848,000 2,487,000 3,076,000 2,855,000 2,720,000 2,441,000 2,377,000 2,721,000 3,763,000 3,020,000 2,842,000 2,182,000 3,770,000 3,188,000 4,124,000 2,824,000 2,916,000 4,245,000 3,533,000 3,302,000 3,870,000 3,112,000 3,988,000 2,270,000 2,135,000 2,654,000 2,453,000 2,548,000 2,546,000 3,363,000 3,343,000 2,864,000 4,080,000 3,652,000 3,362,000 
  freight                   1,313,000 2,216,000 1,862,000 1,818,000 2,635,000 3,831,000 5,302,000 4,170,000 1,767,000 1,468,000 950,000 1,187,000 1,606,000 2,203,000 1,699,000 1,378,000 1,579,000 2,118,000 2,326,000 1,963,000 1,874,000 2,313,000 2,750,000 2,446,000 2,504,000 2,797,000 2,480,000 2,274,000 2,154,000 2,285,000 1,990,000 1,982,000 2,585,000 1,693,000 1,596,000 1,762,000 2,135,000 1,947,000 1,649,000 1,517,000 2,038,000 1,650,000 1,312,000 1,257,000 1,372,000 1,572,000 1,395,000 1,386,000 
  real estate tax                   1,658,000                                                
  notes payable, net of unamortized debt issuance costs of 150 and 31 in 2020 and 2019, respectively                   8,848,000                                                
  class b stock, convertible, par value .10 per share, issued 2,437,402 shares in 2020 and 2,576,479 shares in 2019                   244,000                                                
  other intangibles, net of accumulated amortization of 415 and 299 at april 30, 2020 and july 31, 2019, respectively                    1,551,000                                               
  customer list, net of accumulated amortization of 6,739 and 6,297 at april 30, 2020 and july 31, 2019, respectively                    1,046,000                                               
  current maturities of notes payable, net of unamortized debt issuance costs of 10 at april 30, 2020                    3,074,000                                               
  accrued expenses:                                                                   
  notes payable, net of unamortized debt issuance costs of 31 at july 31, 2019                                                                   
  class b stock, par value .10 per share, issued 2,511,958 shares at april 30, 2020 and 2,576,479 shares at july 31, 2019                    251,000                                               
  other intangibles, net of accumulated amortization of 398 and 299 at january 31, 2020 and july 31, 2019, respectively                     1,545,000                                              
  customer list, net of accumulated amortization of 6,592 and 6,297 at january 31, 2020 and july 31, 2019, respectively                     1,193,000                                              
  current maturities of notes payable, net of unamortized debt issuance costs of 17 at january 31, 2020                     3,067,000                                              
  class b stock, par value .10 per share, issued 2,531,986 shares at january 31, 2020 and 2,576,479 shares at july 31, 2019                     253,000                                              
  other intangibles, net of accumulated amortization of 371 and 299 at october 31, 2019 and july 31, 2019, respectively                      1,551,000                                             
  customer list, net of accumulated amortization of 6,444 and 6,297 at october 31, 2019 and july 31, 2019, respectively                      1,341,000                                             
  current maturities of notes payable, net of unamortized debt issuance costs of 24 at october 31, 2019                      3,059,000                                             
  class b stock, par value .10 per share, issued 2,533,575 shares at october 31, 2019 and 2,576,479 shares at july 31, 2019                      253,000                                             
  short-term investments                        730,000 480,000 2,652,000 7,124,000 14,297,000 21,894,000 18,133,000 23,576,000 18,700,000 7,358,000 5,359,000 10,184,000 10,493,000 15,092,000 3,390,000 2,190,000 480,000 940,000 1,901,000 2,640,000 3,240,000 7,100,000 15,187,000 18,459,000                    
  trademarks and patents, net of accumulated amortization of 299 and 267 in 2019 and 2018, respectively                       1,599,000                                            
  customer list, net of accumulated amortization of 6,297 and 5,540 in 2019 and 2018, respectively                       1,488,000                                            
  notes payable, net of unamortized debt issuance costs of 31 and 60 in 2019 and 2018, respectively                       3,052,000                                            
  class b stock, convertible, par value .10 per share, issued 2,576,479 shares in 2019 and 2,468,979 shares in 2018                       258,000                                            
  trademarks and patents, net of accumulated amortization of 291 and 267 at april 30, 2019 and july 31, 2018, respectively                        1,356,000                                           
  customer list, net of accumulated amortization of 6,107 and 5,540 at april 30, 2019 and july 31, 2018, respectively                        1,678,000                                           
  notes payable, net of unamortized debt issuance costs of 39 and 60 at april 30, 2019 and july 31, 2018, respectively                        3,045,000                                           
  class b stock, par value .10 per share, issued 2,576,479 shares at april 30, 2019 and 2,468,979 shares at july 31, 2018                        257,000                                           
  trademarks and patents, net of accumulated amortization of 283 and 267 at january 31, 2019 and july 31, 2018, respectively                         1,298,000                                          
  customer list, net of accumulated amortization of 5,918 and 5,540 at january 31, 2019 and july 31, 2018, respectively                         1,867,000                                          
  notes payable, net of unamortized debt issuance costs of 46 and 60 at january 31, 2019 and july 31, 2018, respectively                         3,038,000                                          
  class b stock, par value .10 per share, issued 2,576,479 shares at january 31, 2019 and 2,468,979 shares at july 31, 2018                         258,000                                          
  trademarks and patents, net of accumulated amortization of 276 and 267 at october 31, 2018 and july 31, 2018, respectively                          1,253,000                                         
  customer list, net of accumulated amortization of 5,729 and 5,540 at october 31, 2018 and july 31, 2018, respectively                          2,056,000                                         
  notes payable, net of unamortized debt issuance costs of 53 and 60 at october 31, 2018 and july 31, 2018, respectively                          3,031,000                                         
  class b stock, par value .10 per share, issued 2,569,979 shares at october 31, 2018 and 2,468,979 shares at july 31, 2018                          257,000                                         
  trademarks and patents, net of accumulated amortization of 267 and 238 in 2018 and 2017, respectively                           1,220,000                                        
  customer list, net of accumulated amortization of 5,540 and 4,601 in 2018 and 2017, respectively                           2,245,000                                        
  notes payable, net of unamortized debt issuance costs of 60 and 89 in 2018 and 2017, respectively                           6,107,000                                        
  class b stock, convertible, par value .10 per share, issued 2,468,979 shares in 2018 and 2,513,512 shares in 2017                           247,000                                        
  trademarks and patents, net of accumulated amortization of 259 and 238 at april 30, 2018 and july 31, 2017, respectively                            1,306,000                                       
  customer list, net of accumulated amortization of 5,305 and 4,601 at april 30, 2018 and july 31, 2017, respectively                            2,480,000                                       
  short-term borrowing                            6,000,000                                       
  notes payable, net of unamortized debt issuance costs of 68 and 89 at april 30, 2018 and july 31, 2017, respectively                            6,099,000                                       
  class b stock, par value .10 per share, issued 2,503,678 shares at april 30, 2018 and 2,513,512 shares at july 31, 2017                            250,000                                       
  trademarks and patents, net of accumulated amortization of 251 and 238 at january 31, 2018 and july 31, 2017, respectively                             1,300,000                                      
  customer list, net of accumulated amortization of 5,070 and 4,601 at january 31, 2018 and july 31, 2017, respectively                             2,715,000                                      
  notes payable, net of unamortized debt issuance costs of 75 and 89 at january 31, 2018 and july 31, 2017, respectively                             6,092,000                                      
  class b stock, par value .10 per share, issued 2,503,678 shares at january 31, 2018 and 2,513,512 shares at july 31, 2017                             250,000                                      
  trademarks and patents, net of accumulated amortization of 244 and 238 at october 31, 2017 and july 31, 2017, respectively                              1,273,000                                     
  customer list, net of accumulated amortization of 4,835 and 4,601 at october 31, 2017 and july 31, 2017, respectively                              2,950,000                                     
  notes payable, net of unamortized debt issuance costs of 82 and 89 at october 31, 2017 and july 31, 2017, respectively                              6,085,000                                     
  class b stock, par value .10 per share, issued 2,507,122 shares at october 31, 2017 and 2,513,512 shares at july 31, 2017                              251,000                                     
  trademarks and patents, net of accumulated amortization of 238 and 261 in 2017 and 2016, respectively                               1,223,000                                    
  customer list, net of accumulated amortization of 4,601 and 3,460 in 2017 and 2016, respectively                               3,184,000                                    
  notes payable, net of unamortized debt issuance costs of 89 and 118 in 2017 and 2016, respectively                               9,161,000                                    
  class b stock, convertible, par value .10 per share, issued 2,513,512 shares in 2017 and 2,515,735 shares in 2016                               251,000                                    
  trademarks and patents, net of accumulated amortization of 287 and 261 at april 30, 2017 and july 31, 2016, respectively                                1,136,000                                   
  customer list, net of accumulated amortization of 4,315 and 3,460 at april 30, 2017 and july 31, 2016, respectively                                3,469,000                                   
  notes payable, net of unamortized debt issuance costs of 96 and 118 at april 30, 2017 and july 31, 2016, respectively                                9,154,000                                   
  class b stock, par value .10 per share, issued 2,513,512 shares at april 30, 2017 and 2,515,735 shares at july 31, 2016                                251,000                                   
  trademarks and patents, net of accumulated amortization of 279 and 261 at january 31, 2017 and july 31, 2016, respectively                                 999,000                                  
  customer list, net of accumulated amortization of 4,031 and 3,460 at january 31, 2017 and july 31, 2016, respectively                                 3,754,000                                  
  notes payable, net of unamortized debt issuance costs of 103 and 118 at january 31, 2017 and july 31, 2016, respectively                                 9,147,000                                  
  class b stock, par value .10 per share, issued 2,513,512 shares at january 31, 2017 and 2,515,735 shares at july 31, 2016                                 251,000                                  
  trademarks and patents, net of accumulated amortization of 269 and 261 at october 31, 2016 and july 31, 2016, respectively                                  979,000                                 
  customer list, net of accumulated amortization of 3,745 and 3,460 at october 31, 2016 and july 31, 2016, respectively                                  4,040,000                                 
  notes payable, net of unamortized debt issuance costs of 110 and 118 at october 31, 2016 and july 31, 2016, respectively                                  9,140,000                                 
  class b stock, par value .10 per share, issued 2,513,512 shares at october 31, 2016 and 2,515,735 shares at july 31, 2016                                  251,000                                 
  trademarks and patents, net of accumulated amortization of 261 and 301 in 2016 and 2015, respectively                                   916,000                                
  debt issuance costs, net of accumulated amortization of 161 and 133 in 2016 and 2015, respectively                                   118,000                                
  customer list, net of accumulated amortization of 3,460 and 2,094 in 2016 and 2015, respectively                                   4,325,000                                
  notes payable                                   12,333,000 12,333,000 12,333,000 12,333,000 15,417,000 15,417,000 15,417,000 15,417,000 18,900,000 18,900,000 18,900,000 18,900,000 22,400,000 22,400,000 22,400,000 22,400,000 25,900,000 25,900,000 27,400,000 27,400,000 29,700,000 29,700,000 31,200,000 12,700,000 14,800,000 16,800,000 31,080,000 31,080,000 31,160,000 35,160,000 20,160,000 20,240,000 
  class b stock, convertible, par value .10 per share, issued 2,515,735 shares in 2016 and 2,389,735 shares in 2015                                   252,000                                
  trademarks and patents, net of accumulated amortization of 319 and 301 at april 30, 2016 and july 31, 2015, respectively                                    906,000                               
  debt issuance costs, net of accumulated amortization of 154 and 133 at april 30, 2016 and july 31, 2015, respectively                                    125,000                               
  customer list, net of accumulated amortization of 3,119 and 2,094 at april 30, 2016 and july 31, 2015, respectively                                    4,666,000                               
  class b stock, par value .10 per share, issued 2,515,735 shares at april 30, 2016 and 2,389,735 shares at july 31, 2015                                    252,000                               
  trademarks and patents, net of accumulated amortization of 313 and 301 at january 31, 2016 and july 31, 2015, respectively                                     879,000                              
  debt issuance costs, net of accumulated amortization of 147 and 133 at january 31, 2016 and july 31, 2015, respectively                                     132,000                              
  customer list, net of accumulated amortization of 2,777 and 2,094 at january 31, 2016 and july 31, 2015, respectively                                     5,008,000                              
  class b stock, par value .10 per share, issued 2,515,735 shares at january 31, 2016 and 2,389,735 shares at july 31, 2015                                     252,000                              
  trademarks and patents, net of accumulated amortization of 307 and 301 at october 31, 2015 and july 31, 2015, respectively                                      822,000                             
  debt issuance costs, net of accumulated amortization of 140 and 133 at october 31, 2015 and july 31, 2015, respectively                                      139,000                             
  customer list, net of accumulated amortization of 2,436 and 2,094 at october 31, 2015 and july 31, 2015, respectively                                      5,349,000                             
  class b stock, par value .10 per share, issued 2,515,735 shares at october 31, 2015 and 2,389,735 shares at july 31, 2015                                      252,000                             
  restricted unearned stock compensation                                      -4,658,000 -931,000 -1,223,000 -1,829,000 -2,120,000 -2,225,000 -2,571,000 -2,277,000 -2,595,000 -1,824,000 -2,072,000 -1,969,000 -2,179,000 -2,214,000 -2,422,000 -2,173,000 -2,342,000 -2,446,000 -2,608,000 -2,724,000 -2,911,000 -234,000 -389,000 -1,144,000 -1,226,000 -1,390,000 -68,000 -81,000 -75,000 
  restricted cash                                          100,000 129,000 191,000 500,000                      
  trademarks and patents, net of accumulated amortization of 301 and 420 in 2015 and 2014, respectively                                       818,000                            
  debt issuance costs, net of accumulated amortization of 133 and 522 in 2015 and 2014, respectively                                       146,000                            
  licensing agreements and non-compete agreements, net of accumulated amortization of 1,145 in 2014                                                                   
  customer list, net of accumulated amortization of 2,094 and 764 in 2015 and 2014, respectively                                       5,691,000                            
  class b stock, convertible, par value .10 per share, issued 2,389,735 shares in 2015 and 2,394,735 shares in 2014                                       239,000                            
  unrealized gain on marketable securities                                           114,000 114,000 84,000 78,000 86,000 74,000 71,000 75,000 72,000 78,000 66,000 70,000 71,000 86,000 68,000 63,000 64,000 57,000 61,000 53,000 58,000 54,000 40,000 38,000 
  trademarks and patents, net of accumulated amortization of 316 and 420 at april 30, 2015 and july 31, 2014, respectively                                        903,000                           
  debt issuance costs, net of accumulated amortization of 432 and 522 at april 30, 2015 and july 31 2014, respectively                                        170,000                           
  licensing agreements and non-compete agreements, net of accumulated amortization of 1,285 and 1,145 at april 30, 2015 and july 31, 2014, respectively                                        15,000                           
  customer list, net of accumulated amortization of 1,762 and 764 at april 30, 2015 and july 31, 2014, respectively                                        6,023,000                           
  class b stock, par value .10 per share, issued 2,389,735 shares at april 30, 2015 and 2,394,735 shares at july 31, 2014                                        239,000                           
  accumulated other comprehensive income:                                                                   
  trademarks and patents, net of accumulated amortization of 309 and 420 at january 31, 2015 and july 31, 2014, respectively                                         751,000                          
  debt issuance costs, net of accumulated amortization of 407 and 522 at january 31, 2015 and july 31 2014, respectively                                         194,000                          
  licensing agreements and non-compete agreements, net of accumulated amortization of 1,238 and 1,145 at january 31, 2015 and july 31, 2014, respectively                                         62,000                          
  customer list, net of accumulated amortization of 1,428 and 764 at january 31, 2015 and july 31, 2014, respectively                                         6,356,000                          
  class b stock, par value .10 per share, issued 2,389,735 shares at january 31, 2015 and 2,394,735 shares at july 31, 2014                                         239,000                          
  trademarks and patents, net of accumulated amortization of 303 and 420 at october 31, 2014 and july 31, 2014, respectively                                          694,000                         
  debt issuance costs, net of accumulated amortization of 383 and 522 at october 31, 2014 and july 31 2014, respectively                                          219,000                         
  licensing agreements and non-compete agreements, net of accumulated amortization of 1,192 and 1,145 at october 31, 2014 and july 31, 2014, respectively                                          108,000                         
  customer list, net of accumulated amortization of 1,097 at october 31, 2014 and 764 at july 31, 2014, respectively                                          6,688,000                         
  class b stock, par value .10 per share, issued 2,389,735 shares at october 31, 2014 and 2,394,735 shares at july 31, 2014                                          239,000                         
  trademarks and patents, net of accumulated amortization of 420 and 427 in 2014 and 2013, respectively                                           660,000                        
  debt issuance costs, net of accumulated amortization of 522 and 455 in 2014 and 2013, respectively                                           243,000                        
  licensing agreements and non-compete agreements, net of accumulated amortization of 1,145 and 1,861 in 2014 and 2013, respectively                                           155,000                        
  customer list, net of accumulated amortization of 764 in 2014                                           7,020,000                        
  class b stock, convertible, par value .10 per share, issued 2,394,735 shares in 2014 and 2,394,487 shares in 2013                                           239,000                        
  trademarks and patents, net of accumulated amortization of 415 and 427 at april 30, 2014 and july 31, 2013, respectively                                            635,000                       
  debt issuance costs, net of accumulated amortization of 505 and 455 at april 30, 2014 and july 31 2013, respectively                                            259,000                       
  licensing agreements and non-compete agreements, net of accumulated amortization of 1,099 and 1,861 at april 30, 2014 and july 31, 2013, respectively                                            201,000                       
  customer list, net of accumulated amortization of 510 at april 30, 2014                                            7,275,000                       
  class b stock, par value .10 per share, issued 2,394,735 shares at april 30, 2014 and 2,394,487 shares at july 31, 2013                                            238,000                       
  trademarks and patents, net of accumulated amortization of 439 and 427 at january 31, 2014 and july 31, 2013, respectively                                             661,000                      
  debt issuance costs, net of accumulated amortization of 488 and 455 at january 31, 2014 and july 31 2013, respectively                                             277,000                      
  licensing agreements and non-compete agreements, net of accumulated amortization of 1,986 and 1,861 at january 31, 2014 and july 31, 2013, respectively                                             253,000                      
  customer list, net of accumulated amortization of 255 at january 31, 2014                                             7,530,000                      
  class b stock, par value .10 per share, issued 2,399,668 shares at january 31, 2014 and 2,394,487 shares at july 31, 2013                                             240,000                      
  trademarks and patents, net of accumulated amortization of 433 and 427 at october 31, 2013 and july 31, 2013, respectively                                              577,000                     
  debt issuance costs, net of accumulated amortization of 472 and 455 at october 31, 2013 and july 31 2013, respectively                                              293,000                     
  licensing agreements and non-compete agreements, net of accumulated amortization of 1,924 and 1,861 at october 31, 2013 and july 31, 2013, respectively                                              316,000                     
  class b stock, par value .10 per share, issued 2,399,668 shares at october 31, 2013 and 2,394,487 shares at july 31, 2013                                              240,000                     
  trademarks and patents, net of accumulated amortization of 427 and 409 in 2013 and 2012, respectively                                               581,000                    
  debt issuance costs, net of accumulated amortization of 455 and 380 in 2013 and 2012, respectively                                               309,000                    
  licensing agreements and non-compete agreements, net of accumulated amortization of 1,861 and 1,611 in 2013 and 2012, respectively                                               378,000                    
  class b stock, par value .10 per share, issued 2,394,487 shares in 2013 and 2,374,859 shares in 2012                                               239,000                    
  investment in short-term securities                                                17,446,000 10,388,000 7,940,000 9,163,000 9,043,000 8,965,000 8,390,000 15,837,000 20,753,000 21,375,000 3,854,000         
  trademarks and patents, net of accumulated amortization of 420 and 409 at april 30, 2013 and july 31, 2012, respectively                                                590,000                   
  debt issuance costs, net of accumulated amortization of 436 and 380 at april 30, 2013 and july 31 2012, respectively                                                329,000                   
  licensing agreements and non-compete agreements, net of accumulated amortization of 1,799 and 1,611 at april 30, 2013 and july 31, 2012, respectively                                                440,000                   
  class b stock, par value .10 per share, issued 2,394,487 shares at april 30, 2013 and 2,374,859 shares at july 31, 2012                                                240,000                   
  trademarks and patents, net of accumulated amortization of 414 and 409 at january 31, 2013 and july 31, 2012, respectively                                                 591,000                  
  debt issuance costs, net of accumulated amortization of 417 and 380 at january 31, 2013 and july 31 2012, respectively                                                 348,000                  
  licensing agreements and non-compete agreements, net of accumulated amortization of 1,736 and 1,611 at january 31, 2013 and july 31, 2012, respectively                                                 503,000                  
  class b stock, par value .10 per share, issued 2,394,487 shares at january 31, 2013 and 2,374,859 shares at july 31, 2012                                                 240,000                  
  trademarks and patents, net of accumulated amortization of 407 and 409 at october 31, 2012 and july 31, 2012, respectively                                                  594,000                 
  debt issuance costs, net of accumulated amortization of 398 and 380 at october 31, 2012 and july 31 2012, respectively                                                  367,000                 
  licensing agreements and non-compete agreements, net of accumulated amortization of 1,674 and 1,611 at october 31, 2012 and july 31, 2012, respectively                                                  564,000                 
  class b stock, par value .10 per share, issued 2,382,209 shares at october 31, 2012 and 2,374,859 shares at july 31, 2012                                                  238,000                 
  trademarks and patents, net of accumulated amortization of 409 and 381 in 2012 and 2011, respectively                                                   576,000                
  debt issuance costs, net of accumulated amortization of 380 and 333 in 2012 and 2011, respectively                                                   385,000                
  licensing agreements and non-compete agreements, net of accumulated amortization of 1,611 and 1,361 in 2012 and 2011, respectively                                                   627,000                
  class b stock, par value .10 per share, issued 2,374,859 shares in 2012 and 2,372,859 shares in 2011                                                   237,000                
  trademarks and patents, net of accumulated amortization of 401 and 381 at april 30, 2012 and july 31, 2011, respectively                                                    569,000               
  debt issuance costs, net of accumulated amortization of 392 and 333 at april 30, 2012 and july 31 2011, respectively                                                    404,000               
  licensing agreements and non-compete agreements, net of accumulated amortization of 1,548 and 1,361 at april 30, 2012 and july 31, 2011, respectively                                                    690,000               
  class b stock, par value .10 per share, issued 2,374,859 shares at april 30, 2012 and 2,372,859 shares at july 31, 2011                                                    238,000               
  trademarks and patents, net of accumulated amortization of 394 and 381 at january 31, 2012 and july 31, 2011, respectively                                                     576,000              
  debt issuance costs, net of accumulated amortization of 373 and 333 at january 31, 2012 and july 31 2011, respectively                                                     423,000              
  licensing agreements and non-compete agreements, net of accumulated amortization of 1,486 and 1,361 at january 31, 2012 and july 31, 2011, respectively                                                     752,000              
  class b stock, par value .10 per share, issued 2,372,859 shares at january 31, 2012 and 2,372,859 shares at july 31, 2011                                                     237,000              
  trademarks and patents, net of accumulated amortization of 388 and 381 at october 31, 2011 and july 31, 2011, respectively                                                      582,000             
  debt issuance costs, net of accumulated amortization of 353 and 333 at october 31, 2011 and july 31 2011, respectively                                                      443,000             
  licensing agreements and non-compete agreements, net of accumulated amortization of 1,423 and 1,361 at october 31, 2011 and july 31, 2011, respectively                                                      815,000             
  class b stock, par value .10 per share, issued 2,372,859 shares at october 31, 2011 and 2,372,859 shares at july 31, 2011                                                      237,000             
  trademarks and patents, net of accumulated amortization of 381 and 357 in 2011 and 2010, respectively                                                       589,000            
  debt issuance costs, net of accumulated amortization of 333 and 524 in 2011 and 2010, respectively                                                       463,000            
  licensing agreements and non-compete agreements, net of accumulated amortization of 1,361 and 3,611 in 2011 and 2010, respectively                                                       878,000            
  class b stock, par value .10 per share, issued 2,372,859 shares in 2011 and 2,244,217 shares in 2010                                                       237,000            
  trademarks and patents, net of accumulated amortization of 374 and 357 at april 30, 2011 and july 31, 2010, respectively                                                        596,000           
  debt issuance costs, net of accumulated amortization of 391 and 524 at april 30, 2011 and july 31 2010, respectively                                                        437,000           
  licensing agreements and non-compete agreements, net of accumulated amortization of 1,298 and 3,611 at april 30, 2011 and july 31, 2010, respectively                                                        940,000           
  class b stock, par value .10 per share, issued 2,373,059 shares at april 30, 2011 and 2,244,217 shares at july 31, 2010                                                        237,000           
  trademarks and patents, net of accumulated amortization of 367 and 357 at january 31, 2011 and july 31, 2010, respectively                                                         603,000          
  debt issuance costs, net of accumulated amortization of 372 and 524 at january 31, 2011 and july 31, 2010, respectively                                                         502,000          
  licensing agreements and non-compete agreements, net of accumulated amortization of 1,236 and 3,611 at january 31, 2011 and july 31, 2010, respectively                                                         1,003,000          
  the accompanying notes are an integral part of the condensed consolidated financial statements.                                                                   
  condensed consolidated balance sheets                                                                   
  7,679,721 shares at january 31, 2011 and 7,639,922 shares at july 31, 2010                                                         768,000          
  class b stock, par value .10 per share, issued                                                                   
  2,374,150 shares at january 31, 2011 and 2,244,217 shares at july 31, 2010                                                         237,000          
  less treasury stock, at cost (2,630,169 common and 324,741                                                                   
  class b shares at january 31, 2011 and 2,558,764 common and                                                                   
  324,741 class b shares at july 31, 2010)                                                         -49,178,000 -47,706,000         
  572 at october 31, 2010 and july 31, 2010, respectively                                                          28,037,000         
  trademarks and patents, net of accumulated amortization                                                                   
  of 364 and 357 at october 31, 2010 and july 31, 2010, respectively                                                          609,000         
  debt issuance costs, net of accumulated amortization                                                                   
  of 353 and 524 at october 31, 2010 and july 31, 2010, respectively                                                          241,000         
  licensing agreements and non-compete agreements, net of                                                                   
  accumulated amortization of 1,173 and 3,611 at october 31, 2010 and july 31, 2010, respectively                                                          1,067,000         
  oil-dri corporation of america & subsidiaries                                                                   
  7,662,221 shares at october 31, 2010 and 7,639,922 shares at july 31, 2010                                                          767,000         
  2,374,150 shares at october 31, 2010 and 2,244,217 shares at july 31, 2010                                                          237,000         
  less treasury stock, at cost (2,563,821 common and 324,741                                                                   
  class b shares at october 31, 2010 and 2,558,764 common and                                                                   
  investment in securities                                                           3,999,000 8,997,000       
  652 at april 30, 2010 and july 31, 2009, respectively                                                           26,721,000        
  of 359 and 351 at april 30, 2010 and july 31, 2009, respectively                                                           627,000        
  of 511 and 473 at april 30, 2010 and july 31, 2009, respectively                                                           268,000        
  accumulated amortization of 3,548 and 3,361 at april 30, 2010 and july 31, 2009, respectively                                                           1,190,000        
  7,618,991 shares at april 30, 2010 and 7,475,171 shares at july 31, 2009                                                           762,000        
  2,244,217 shares at april 30, 2010 and 2,240,201 shares at july 31, 2009                                                           224,000        
  less treasury stock, at cost (2,386,650 common and 324,741                                                                   
  class b shares at april 30, 2010 and 2,282,521 common and                                                                   
  324,741 class b shares at july 31, 2009)                                                           -43,620,000        
  trademarks and patents, net of accumulated amortization of 359 and 351 at october 31, 2009 and july 31, 2009, respectively                                                            641,000       
  debt issuance costs, net of accumulated amortization of 485 and 473 at october 31, 2009 and july 31, 2009, respectively                                                            294,000       
  licensing agreements and non-compete agreements, net of accumulated amortization of 3,423 and 3,361 at october 31, 2009 and july 31, 2009, respectively                                                            1,315,000       
  class b stock, par value .10 per share, issued 2,245,383 shares at october 31, 2009 and 2,240,201 shares at july 31, 2009                                                            225,000       
  investment in treasury securities                                                             18,846,000 16,851,000 18,673,000 21,704,000 11,485,000 13,098,000 
  prepaid overburden removal expense                                                               1,503,000 1,498,000 1,526,000 1,370,000 
  trademarks and patents, net of accumulated amortization of 321 and 308 at january 31, 2007 and july 31, 2006, respectively                                                             787,000      
  debt issuance costs, net of accumulated amortization of 414 and 393 at january 31, 2007 and july 31, 2006, respectively                                                             427,000      
  licensing agreements, net of accumulated amortization of 2,657 and 2,558 at january 31, 2007 and july 31, 2006, respectively                                                             782,000      
  class b stock, par value .10 per share, issued 2,234,538 shares at january 31, 2007 and 2,234,544 shares at july 31, 2006                                                             223,000      
  trademarks and patents, net of accumulated amortization of 314 and 308 at october 31, 2006 and july 31, 2006, respectively                                                              789,000     
  debt issuance costs, net of accumulated amortization of 404 and 393 at october 31, 2006 and july 31, 2006, respectively                                                              437,000     
  licensing agreements, net of accumulated amortization of 2,608 and 2,558 at october 31, 2006 and july 31, 2006, respectively                                                              831,000     
  class b stock, par value .10 per share, issued 2,234,538 shares at october 31, 2006 and 2,234,544 shares at july 31, 2006                                                              223,000     
  investment in debt securities                                                               302,000 908,000 1,028,000 392,000 
  trademarks and patents, net of accumulated amortization of 300 and 305 at april 30, 2006 and july 31, 2005, respectively                                                               781,000    
  debt issuance costs, net of accumulated amortization of 382 and 356 at april 30, 2006 and july 31, 2005, respectively                                                               455,000    
  licensing agreements, net of accumulated amortization of 2,510 and 2,359 at april 30, 2006 and july 31, 2005, respectively                                                               929,000    
  class b stock, par value .10 per share, issued 1,800,083 shares at april 30, 2006 and 1,800,083 shares at july 31, 2005                                                               180,000    
  trademarks and patents, net of accumulated amortization of 296 and 305 at january 31, 2006 and july 31, 2005, respectively                                                                779,000   
  debt issuance costs, net of accumulated amortization of 364 and 356 at january 31, 2006 and july 31, 2005, respectively                                                                420,000   
  licensing agreements, net of accumulated amortization of 2,459 and 2,359 at january 31, 2006 and july 31, 2005, respectively                                                                980,000   
  class b stock, par value .10 per share, issued 1,800,083 shares at january 31, 2006 and 1,800,083 shares at july 31, 2005                                                                180,000   
  intangibles, net of accumulated amortization of 3,058 and 3,019 at october 31, 2005 and july 31, 2005, respectively                                                                 1,911,000  
  class b stock, par value .10 per share, issued 1,800,083 shares at october 31, 2005 and 1,800,083 shares at july 31, 2005                                                                 180,000  
  property, plant and equipment, at cost                                                                   
  intangibles                                                                  1,965,000 
  class b stock, par value .10 per share, issued 1,800,083 shares in 2005 and 1,792,583 in 2004                                                                  180,000 

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