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Note 6 - Investments in Joint Ventures - Condensed Balance Sheet of EXCOR and All Other Joint Ventures (Details) - USD ($)
May 31, 2020
Aug. 31, 2019
Current assets $ 32,605,434 $ 33,302,362
Total assets 64,531,134 67,511,087
Current liabilities 4,470,256 7,841,793
Noncurrent liabilities 314,474
Joint ventures’ equity 56,665,736 56,594,615
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings 19,706,983 22,178,126
EXCOR and All Other [Member]    
Joint ventures’ equity 21,942,063 24,207,339
EXCOR [Member]    
Joint ventures’ equity 11,728,423 14,046,842
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings 11,697,518 14,015,937
All Other [Member]    
Joint ventures’ equity 10,213,640 10,160,497
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings 8,009,465 8,162,189
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]    
Current assets 52,424,780 59,162,834
Total assets 56,403,406 63,326,703
Current liabilities 11,741,077 14,145,499
Noncurrent liabilities 32,412 20,797
Joint ventures’ equity 44,629,920 49,160,407
EXCOR [Member]    
Current assets 23,825,008 29,139,787
Total assets 26,143,537 31,666,841
Current liabilities 2,686,694 3,573,160
Noncurrent liabilities
Joint ventures’ equity 23,456,842 28,093,681
All Other [Member]    
Current assets 28,599,772 30,023,047
Total assets 30,259,869 31,659,862
Current liabilities 9,054,383 10,572,339
Noncurrent liabilities 32,412 20,797
Joint ventures’ equity $ 21,173,078 $ 21,066,726