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Note 7 - Condensed Balance Sheet of EXCOR and Tianjin Zerust, and All Other Joint Ventures (Details) - USD ($)
Aug. 31, 2015
Aug. 31, 2014
EXCOR [Member]    
Current assets $ 22,620,323 $ 24,361,157
Total assets 24,606,880 26,652,165
Current liabilities $ 3,360,142 $ 3,512,143
Noncurrent liabilities
Joint ventures’ equity $ 21,246,738 $ 23,140,022
Northern Technologies International Corporation’s share of joint ventures’ equity 11,571,361 11,570,013
Northern Technologies International Corporation's share of joint ventures’ undistributed earnings 11,540,456 11,539,108
Joint Venture in India [Member]    
Current assets 4,035,396  
Total assets 4,328,196  
Current liabilities 1,030,718  
Noncurrent liabilities 155,168  
Joint ventures’ equity 3,142,310  
Northern Technologies International Corporation’s share of joint ventures’ equity 1,482,342  
Northern Technologies International Corporation's share of joint ventures’ undistributed earnings 617,520  
Tianjin Zerust [Member]    
Current assets   9,774,680
Total assets   9,793,803
Current liabilities   4,438,380
Noncurrent liabilities   868,377
Joint ventures’ equity   4,487,046
Northern Technologies International Corporation’s share of joint ventures’ equity   2,243,524
Northern Technologies International Corporation's share of joint ventures’ undistributed earnings   2,193,524
Joint Venture in Finland [Member]    
Current assets 1,415,816  
Total assets 2,197,047  
Current liabilities 178,961  
Noncurrent liabilities 433,624  
Joint ventures’ equity 1,584,461  
Northern Technologies International Corporation’s share of joint ventures’ equity 840,263  
Northern Technologies International Corporation's share of joint ventures’ undistributed earnings 820,263  
All Other [Member]    
Current assets 21,223,581 27,356,120
Total assets 21,721,815 29,020,996
Current liabilities 7,718,562 9,592,111
Noncurrent liabilities 626,347 1,061,111
Joint ventures’ equity 13,376,908 18,367,775
Northern Technologies International Corporation’s share of joint ventures’ equity 6,650,272 9,148,452
Northern Technologies International Corporation's share of joint ventures’ undistributed earnings 5,505,138 6,807,891
Current assets 49,295,116 61,491,957
Total assets 52,853,938 65,466,964
Current liabilities 12,288,383 17,542,634
Noncurrent liabilities 1,215,139 1,929,488
Joint ventures’ equity 39,350,417 45,994,842
Northern Technologies International Corporation’s share of joint ventures’ equity 20,544,238 22,961,989
Northern Technologies International Corporation's share of joint ventures’ undistributed earnings $ 18,483,377 $ 20,540,523