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Note 6 - Investments in Joint Ventures - Condensed Balance Sheet of EXCOR and All Other Joint Ventures (Details) - USD ($)
May 31, 2021
Aug. 31, 2020
Current assets $ 37,228,408 $ 33,202,350
Total assets 72,800,175 66,074,488
Current liabilities 7,552,895 6,097,604
Noncurrent liabilities 373,166 272,443
Joint ventures’ equity 61,374,537 56,659,415
Investments in joint ventures 26,937,857 24,090,826
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]    
Current assets 68,123,606 55,825,418
Total assets 72,216,965 60,295,587
Current liabilities 16,369,403 11,002,867
Noncurrent liabilities 1,225,790 365,274
Joint ventures’ equity 54,621,772 48,927,446
Investments in joint ventures 26,937,857 24,090,826
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings 24,702,778 21,855,747
EXCOR [Member]    
Current assets 30,658,702 25,742,619
Total assets 33,027,046 28,449,772
Current liabilities 3,570,261 2,424,565
Noncurrent liabilities 0 0
Joint ventures’ equity 29,456,785 26,025,207
Investments in joint ventures 14,728,395 13,012,606
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings 14,697,490 12,981,701
All Other [Member]    
Current assets 37,464,904 30,082,799
Total assets 39,189,919 31,845,815
Current liabilities 12,799,142 8,578,302
Noncurrent liabilities 1,225,790 365,274
Joint ventures’ equity 25,164,987 22,902,239
Investments in joint ventures 12,209,462 11,078,220
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings $ 10,005,288 $ 8,874,046