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Note 6 - Investments in Joint Ventures - Condensed Balance Sheet of EXCOR and All Other Joint Ventures (Details) - USD ($)
May 31, 2023
Aug. 31, 2022
May 31, 2003
Current assets $ 39,289,907 $ 40,234,881  
Total assets 87,313,423 86,193,953  
Current liabilities 15,550,561 17,065,401  
Liabilities, Noncurrent 1,831,914 1,884,256  
Joint ventures’ equity 66,397,187 63,595,262  
Investments in joint ventures 22,855,448 21,814,754  
EXCOR and All Other Joint Venturs [Member]      
Investments in joint ventures 22,855,448 21,814,754  
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings 20,493,861 21,256,923  
EXCOR [Member]      
Investments in joint ventures 12,982,891 12,494,320  
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings 12,075,524 12,463,415  
All Other [Member]      
Investments in joint ventures   9,320,434 $ 9,872,553
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings   8,793,508 8,418,337
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]      
Current assets 55,424,661 52,428,831  
Total assets 59,769,982 55,854,457  
Current liabilities 13,229,032 10,981,833  
Liabilities, Noncurrent 300,142 1,138,980  
Joint ventures’ equity 46,240,808 43,733,644  
EXCOR [Member]      
Current assets 26,845,344 26,047,914  
Total assets 28,974,034 27,932,532  
Current liabilities 3,008,256 2,943,895  
Liabilities, Noncurrent 0 0  
Joint ventures’ equity 25,965,777 24,988,637  
Joint Ventures in France [Member]      
Current assets   26,380,917  
Total assets   27,921,925  
Current liabilities   8,037,938  
Liabilities, Noncurrent   1,138,980  
Joint ventures’ equity   $ 18,745,007  
All Other [Member]      
Current assets     28,579,317
Total assets     30,795,948
Current liabilities     10,220,776
Liabilities, Noncurrent $ 300,142    
Joint ventures’ equity     $ 20,275,031