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Note 6 - Investments in Joint Ventures - Condensed Income Statement of EXCOR and All Other Joint Ventures (Details) - USD ($)
 12 Months Ended
Aug. 31, 2017
Aug. 31, 2016
Net sales $ 101,261,132 $ 90,646,833
Gross profit 44,861,300 40,440,726
Net income 11,839,933 9,534,771
Northern Technologies International Corporation’s share of equity in income of joint ventures 5,898,908 4,743,831
Northern Technologies International Corporation's dividends received from joint ventures 6,377,054 5,503,314
EXCOR [Member]    
Net sales 39,849,757 35,138,214
Gross profit 21,133,632 18,635,421
Net income 8,369,728 7,049,462
Northern Technologies International Corporation’s share of equity in income of joint ventures 4,185,988 3,534,113
Northern Technologies International Corporation's dividends received from joint ventures 5,379,062 4,364,700
Joint Venture in India [Member]    
Net sales 61,411,375 55,508,619
Gross profit 23,727,668 21,805,305
Net income 3,470,205 2,485,309
Northern Technologies International Corporation’s share of equity in income of joint ventures 1,712,920 1,209,718
Northern Technologies International Corporation's dividends received from joint ventures $ 997,992 $ 1,165,614