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Note 6 - Investments in Joint Ventures - Condensed Balance Sheet of EXCOR and All Other Joint Ventures (Details) - USD ($)
Aug. 31, 2020
Aug. 31, 2019
Current assets $ 33,202,350 $ 33,302,362
Total assets 66,074,488 67,511,087
Current liabilities 6,097,604 7,841,793
Noncurrent liabilities 272,443
Joint ventures’ equity 56,659,415 56,594,615
Investments in joint ventures 24,090,826 24,207,339
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]    
Current assets 55,825,418 59,162,834
Total assets 60,295,587 63,326,703
Current liabilities 11,002,867 14,145,499
Noncurrent liabilities 365,274 20,797
Joint ventures’ equity 48,927,446 49,160,407
Investments in joint ventures 24,090,826 24,207,339
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings 21,855,747 22,178,126
EXCOR [Member]    
Current assets 25,742,619 29,139,787
Total assets 28,449,772 31,666,841
Current liabilities 2,424,565 3,573,160
Noncurrent liabilities
Joint ventures’ equity 26,025,207 28,093,681
Investments in joint ventures 13,012,606 14,046,842
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings 12,981,701 14,015,937
Joint Ventures in France [Member]    
Current assets 4,099,160  
Total assets 4,873,484  
Current liabilities 2,073,710  
Noncurrent liabilities  
Joint ventures’ equity 2,799,774  
Investments in joint ventures 1,399,887  
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings 1,399,887  
Joint Ventures in Finland [Member]    
Current assets 1,955,879  
Total assets 2,261,147  
Current liabilities 415,496  
Noncurrent liabilities  
Joint ventures’ equity 1,845,651  
Investments in joint ventures 922,814  
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings 902,814  
Joint Ventures in India [Member]    
Current assets 4,010,855  
Total assets 4,242,660  
Current liabilities 1,007,529  
Noncurrent liabilities 32,999  
Joint ventures’ equity 3,202,132  
Investments in joint ventures 1,603,013  
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings 738,191  
Joint Ventures in Thailand [Member]    
Current assets 4,022,399  
Total assets 4,055,451  
Current liabilities 993,332  
Noncurrent liabilities  
Joint ventures’ equity 3,062,119  
Investments in joint ventures 1,531,060  
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings 1,429,060  
All Other [Member]    
Current assets 15,994,506 30,023,047
Total assets 16,413,073 31,659,862
Current liabilities 4,088,235 10,572,339
Noncurrent liabilities 332,275 20,797
Joint ventures’ equity 11,992,563 21,066,726
Investments in joint ventures 5,621,446 10,160,497
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings $ 4,404,094 $ 8,162,189