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Note 6 - Investments in Joint Ventures - Condensed Balance Sheet of EXCOR and All Other Joint Ventures (Details) - USD ($)
 6 Months Ended 12 Months Ended
Feb. 28, 2018
Aug. 31, 2017
Current assets $ 57,427,392 $ 51,518,210
Total assets 61,497,315 55,633,891
Current liabilities 16,468,617 15,118,074
Noncurrent liabilities 120,481 181,210
Joint ventures’ equity 44,908,217 40,334,607
Northern Technologies International Corporation’s share of joint ventures’ equity 22,259,526 20,035,074
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings 20,230,286 17,960,860
Northern Technologies International Corporation’s dividends received from joint ventures 1,770,116 6,377,054
EXCOR [Member]    
Current assets 25,206,550 22,142,514
Total assets 27,326,727 24,301,194
Current liabilities 4,148,371 4,469,567
Noncurrent liabilities
Joint ventures’ equity 23,178,356 19,831,627
Northern Technologies International Corporation’s share of joint ventures’ equity 11,589,180 9,915,816
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings 11,558,275 9,884,911
Northern Technologies International Corporation’s dividends received from joint ventures 1,199,142 5,379,062
All Other [Member]    
Current assets 32,220,842 29,375,696
Total assets 34,170,588 31,332,697
Current liabilities 12,320,246 10,648,507
Noncurrent liabilities 120,481 181,210
Joint ventures’ equity 21,729,861 20,502,980
Northern Technologies International Corporation’s share of joint ventures’ equity 10,670,346 10,119,258
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings 8,672,011 8,075,949
Northern Technologies International Corporation’s dividends received from joint ventures $ 570,974 $ 997,992