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Note 6 - Condensed Balance Sheet of EXCOR and All Other Joint Ventures (Details) - USD ($)
May 31, 2016
Aug. 31, 2015
EXCOR [Member]    
Current assets $ 22,433,723 $ 22,620,323
Total assets 24,189,092 24,606,880
Current liabilities 4,602,925 3,360,142
Noncurrent liabilities
Joint ventures’ equity 19,586,166 21,246,738
Northern Technologies International Corporation’s share of joint ventures’ equity 9,793,085 11,571,361
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings 9,416,694 11,540,456
All Other [Member]    
Current assets 25,496,698 26,674,793
Total assets 27,200,665 28,247,058
Current liabilities 9,349,093 8,928,241
Noncurrent liabilities 103,392 1,215,139
Joint ventures’ equity 17,748,182 18,103,679
Northern Technologies International Corporation’s share of joint ventures’ equity 8,811,786 8,972,877
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings 6,475,441 6,942,921
Current assets 47,930,421 49,295,116
Total assets 51,389,757 52,853,938
Current liabilities 13,952,018 12,288,383
Noncurrent liabilities 103,392 1,215,139
Joint ventures’ equity 37,334,348 39,350,417
Northern Technologies International Corporation’s share of joint ventures’ equity 18,604,871 20,544,238
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings $ 15,892,135 $ 18,483,377