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Note 6 - Investments in Joint Ventures - Condensed Balance Sheet of EXCOR and All Other Joint Ventures (Details) - USD ($)
Nov. 30, 2020
Aug. 31, 2020
Current assets $ 35,475,804 $ 33,202,350
Total assets 69,205,052 66,074,488
Current liabilities 7,302,886 6,097,604
Noncurrent liabilities 276,042 272,443
Joint ventures’ equity 58,370,435 56,659,415
Investments in joint ventures 24,961,205 24,090,826
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]    
Current assets 61,457,250 55,825,418
Total assets 65,569,012 60,295,587
Current liabilities 14,569,061 11,002,867
Noncurrent liabilities 331,743 365,274
Joint ventures’ equity 50,668,208 48,927,446
Investments in joint ventures 24,961,205 24,090,826
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings 22,726,127 21,855,747
EXCOR [Member]    
Current assets 28,660,652 25,742,619
Total assets 31,051,037 28,449,772
Current liabilities 2,997,769 2,424,565
Noncurrent liabilities 0 0
Joint ventures’ equity 28,053,268 26,025,207
Investments in joint ventures 14,026,636 13,012,606
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings 13,995,731 12,981,701
All Other [Member]    
Current assets 32,796,598 30,082,799
Total assets 34,517,975 31,845,815
Current liabilities 11,571,292 8,578,302
Noncurrent liabilities 331,743 365,274
Joint ventures’ equity 22,614,940 22,902,239
Investments in joint ventures 10,934,569 11,078,220
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings $ 8,730,396 $ 8,874,046