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Note 6 - Investments in Joint Ventures - Condensed Balance Sheet of EXCOR and All Other Joint Ventures (Details) - USD ($)
Aug. 31, 2023
Aug. 31, 2022
Current assets $ 39,671,556 $ 40,234,881
Total assets 89,344,303 86,193,953
Current liabilities 16,721,372 17,065,401
Noncurrent liabilities 1,924,134 1,884,256
Joint ventures’ equity 66,356,273 63,595,262
Investments in joint ventures 23,705,714 21,814,754
EXCOR and All Other Joint Venturs [Member]    
Investments in joint ventures 23,705,714 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 13,683,608 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 10,022,106 9,320,434
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings 8,418,337 8,793,508
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]    
Current assets 55,339,662 52,428,831
Total assets 59,729,348 55,854,457
Current liabilities 11,464,247 10,981,833
Noncurrent liabilities 323,762 1,138,980
Joint ventures’ equity 47,941,339 43,733,644,000
EXCOR [Member]    
Current assets 27,862,458 26,047,914
Total assets 30,054,277 27,932,532
Current liabilities 2,687,064 2,943,895
Noncurrent liabilities 0 0
Joint ventures’ equity 27,367,213 24,988,637,000
Joint Ventures in France [Member]    
Current assets   26,380,917
Total assets   27,921,925
Current liabilities   8,037,938
Noncurrent liabilities   1,138,980
Joint ventures’ equity   $ 18,745,007,000
All Other [Member]    
Current assets 27,477,204  
Total assets 29,675,071  
Current liabilities 8,777,183  
Noncurrent liabilities 323,762  
Joint ventures’ equity $ 20,574,126