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Note 6 - Investments in Joint Ventures - Condensed Balance Sheet of EXCOR and All Other Joint Ventures (Details) - USD ($)
 3 Months Ended 12 Months Ended
Nov. 30, 2017
Aug. 31, 2017
Current assets $ 57,249,505 $ 51,518,210
Total assets 61,290,726 55,633,891
Current liabilities 17,410,457 15,118,074
Noncurrent liabilities 184,251 181,210
Joint ventures’ equity 43,696,018 40,334,607
Northern Technologies International Corporation’s share of joint ventures’ equity 21,701,913 20,035,074
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings 19,590,029 17,960,860
Northern Technologies International Corporation's dividends received from joint ventures 63,937 6,377,054
EXCOR [Member]    
Current assets 25,234,973 22,142,514
Total assets 27,337,417 24,301,194
Current liabilities 4,987,804 4,469,567
Noncurrent liabilities
Joint ventures’ equity 22,349,613 19,831,627
Northern Technologies International Corporation’s share of joint ventures’ equity 11,174,808 9,915,816
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings 11,143,903 9,884,911
Northern Technologies International Corporation's dividends received from joint ventures 5,379,062
Joint Venture in India [Member]    
Current assets 32,014,532 29,375,696
Total assets 33,953,309 31,332,697
Current liabilities 12,422,653 10,648,507
Noncurrent liabilities 184,251 181,210
Joint ventures’ equity 21,346,405 20,502,980
Northern Technologies International Corporation’s share of joint ventures’ equity 10,527,105 10,119,258
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings 8,446,126 8,075,949
Northern Technologies International Corporation's dividends received from joint ventures $ 63,937 $ 997,992