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Note 6 - Investments in Joint Ventures (Details) - Condensed Balance Sheet of EXCOR and Tianjin Zerust, and All Other Joint Ventures - USD ($)
May. 31, 2015
Aug. 31, 2014
Condensed Balance Sheet Statements, Captions [Line Items]    
Current assets $ 49,454,666 $ 61,491,957
Total assets 52,993,622 65,466,964
Current liabilities 12,368,822 17,542,634
Noncurrent liabilities 1,231,277 1,929,488
Joint ventures’ equity 39,393,523 45,994,842
Northern Technologies International Corporation’s share of joint ventures’ equity 19,644,767 22,961,989
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings 17,583,956 20,540,523
EXCOR [Member]    
Condensed Balance Sheet Statements, Captions [Line Items]    
Current assets 22,205,218 24,361,157
Total assets 24,155,320 26,652,165
Current liabilities 3,298,480 3,512,143
Joint ventures’ equity 20,856,840 23,140,022
Northern Technologies International Corporation’s share of joint ventures’ equity 10,428,422 11,570,013
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings 10,397,517 11,539,108
All Other [Member]    
Condensed Balance Sheet Statements, Captions [Line Items]    
Current assets 27,249,448 27,356,120
Total assets 28,838,303 29,020,996
Current liabilities 9,070,342 9,592,111
Noncurrent liabilities 1,231,277 1,061,111
Joint ventures’ equity 18,536,683 18,367,775
Northern Technologies International Corporation’s share of joint ventures’ equity 9,216,345 9,148,452
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings $ 7,186,439 6,807,891
Tianjin Zerust [Member]    
Condensed Balance Sheet Statements, Captions [Line Items]    
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