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Note 6 - Investments in Joint Ventures - Condensed Balance Sheet of EXCOR and All Other Joint Ventures (Details) - USD ($)
Nov. 30, 2019
Aug. 31, 2019
Current assets $ 62,227,465 $ 59,162,834
Total assets 66,157,582 63,326,703
Current liabilities 14,585,105 14,145,499
Noncurrent liabilities 20,886 20,797
Joint ventures’ equity 51,551,596 49,160,407
Northern Technologies International Corporation’s share of joint ventures’ equity 25,402,933 24,207,339
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings 23,373,721 22,178,126
EXCOR [Member]    
Current assets 31,696,156 29,139,787
Total assets 33,959,879 31,666,841
Current liabilities 4,166,716 3,573,160
Noncurrent liabilities
Joint ventures’ equity 29,793,164 28,093,681
Northern Technologies International Corporation’s share of joint ventures’ equity 14,896,584 14,046,842
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings 14,865,679 14,015,937
All Other [Member]    
Current assets 30,531,309 30,023,047
Total assets 32,197,703 31,659,862
Current liabilities 10,418,389 10,572,339
Noncurrent liabilities 20,886 20,797
Joint ventures’ equity 21,758,432 21,066,726
Northern Technologies International Corporation’s share of joint ventures’ equity 10,506,349 10,160,497
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings $ 8,508,042 $ 8,162,189