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Note 6 - Investments in Joint Ventures - Condensed Balance Sheet of EXCOR and All Other Joint Ventures (Details) - USD ($)
 9 Months Ended 12 Months Ended
May 31, 2018
May 31, 2017
Aug. 31, 2017
Current assets $ 58,113,904   $ 51,518,210
Total assets 62,004,849   55,633,891
Current liabilities 16,622,611   15,118,074
Noncurrent liabilities 110,926   181,210
Joint ventures’ equity 45,271,314   40,334,607
Northern Technologies International Corporation’s share of joint ventures’ equity 22,412,792   20,035,074
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings 20,383,580   17,960,860
Northern Technologies International Corporation’s dividends received from joint ventures 2,941,807 $ 5,179,786 6,377,054
EXCOR [Member]      
Current assets 25,734,914   22,142,514
Total assets 27,838,358   24,301,194
Current liabilities 3,830,246   4,469,567
Noncurrent liabilities  
Joint ventures’ equity 24,008,112   19,831,627
Northern Technologies International Corporation’s share of joint ventures’ equity 12,004,058   9,915,816
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings 11,973,153   9,884,911
Northern Technologies International Corporation’s dividends received from joint ventures 1,780,392 4,240,400 5,379,062
All Other [Member]      
Current assets 32,378,990   29,375,696
Total assets 34,166,491   31,332,697
Current liabilities 12,792,365   10,648,507
Noncurrent liabilities 110,926   181,210
Joint ventures’ equity 21,263,202   20,502,980
Northern Technologies International Corporation’s share of joint ventures’ equity 10,408,734   10,119,258
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings 8,410,427   8,075,949
Northern Technologies International Corporation’s dividends received from joint ventures $ 1,161,415 $ 939,386 $ 997,992