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Note 6 - Investments in Joint Ventures - Condensed Balance Sheet of EXCOR and All Other Joint Ventures (Details) - USD ($)
Aug. 31, 2017
Aug. 31, 2016
Current assets $ 51,518,210 $ 48,922,924
Total assets 55,633,891 52,407,026
Current liabilities 15,118,074 12,433,700
Noncurrent liabilities 181,210 100,783
Joint ventures’ equity 40,334,607 39,872,543
Northern Technologies International Corporation’s share of joint ventures’ equity 20,035,074 19,840,774
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings 17,960,860 17,779,912
EXCOR [Member]    
Current assets 22,142,514 22,928,810
Total assets 24,301,194 24,733,340
Current liabilities 4,469,567 3,485,231
Noncurrent liabilities
Joint ventures’ equity 19,831,627 21,248,109
Northern Technologies International Corporation’s share of joint ventures’ equity 9,915,816 10,624,056
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings 9,884,911 10,593,151
Joint Venture in India [Member]    
Current assets 29,375,696 25,994,114
Total assets 31,332,697 27,673,686
Current liabilities 10,648,507 8,948,469
Noncurrent liabilities 181,210 100,783
Joint ventures’ equity 20,502,980 18,624,434
Northern Technologies International Corporation’s share of joint ventures’ equity 10,119,258 9,216,728
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings $ 8,075,949 $ 7,186,761