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Note 6 - Investments in Joint Ventures - Condensed Balance Sheet of EXCOR and All Other Joint Ventures (Details) - USD ($)
Nov. 30, 2023
Aug. 31, 2023
Current assets $ 38,269,414 $ 39,671,556
Total assets 88,802,064 89,344,303
Current liabilities 15,854,269 16,721,372
Noncurrent liabilities 1,931,641 1,924,134
Joint ventures’ equity 67,289,833 66,356,273
Investments in joint ventures 24,599,520 23,705,714
EXCOR and All Other Joint Venturs [Member]    
Investments in joint ventures 24,599,516 23,705,714
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings 23,654,848 20,493,861
EXCOR [Member]    
Investments in joint ventures 14,291,705 13,683,608
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings 14,260,800 12,075,524
All Other [Member]    
Investments in joint ventures 10,307,811 10,022,106
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings 9,394,048 8,418,337
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]    
Current assets 58,856,062 55,339,662
Total assets 63,316,496 59,729,348
Current liabilities 13,323,941 11,464,247
Noncurrent liabilities 300,465 323,762
Joint ventures’ equity 49,692,091 47,941,339
EXCOR [Member]    
Current assets 28,976,285 27,862,458
Total assets 31,258,136 30,054,277
Current liabilities 2,674,730 2,687,064
Noncurrent liabilities 0 0
Joint ventures’ equity 28,583,406 27,367,213
Joint Ventures in France [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
All Other [Member]    
Current assets 29,879,777  
Total assets 32,058,360  
Current liabilities 10,649,211  
Noncurrent liabilities 300,465  
Joint ventures’ equity $ 21,108,685