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Note 6 - Investments in Joint Ventures (Detail) - Condensed Balance Sheet of EXCOR and NTI ASEAN, and All Other Joint Ventures: (USD $)
Nov. 30, 2012
Aug. 31, 2012
Current assets $ 61,936,535 $ 61,973,725
Total assets 68,157,107 68,585,974
Current liabilities 20,079,934 18,686,181
Noncurrent liabilities 4,815,797 4,700,458
Joint ventures’ equity 43,261,376 45,199,335
Northern Technologies International Corporation’s share of joint ventures’ equity 21,435,223 21,461,492
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings 19,341,157 19,403,150
EXCOR [Member]
    
Current assets 21,440,244 24,357,139
Total assets 23,756,509 26,620,589
Current liabilities 4,737,085 4,749,574
Joint ventures’ equity 19,019,424 21,871,015
Northern Technologies International Corporation’s share of joint ventures’ equity 9,509,714 10,935,509
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings 9,478,809 10,904,604
China [Member]
    
Current assets 11,933,790  
Total assets 11,968,500  
Current liabilities 4,822,792  
Noncurrent liabilities 856,547  
Joint ventures’ equity 6,289,161  
Northern Technologies International Corporation’s share of joint ventures’ equity 3,148,679  
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings 3,095,230  
All Other [Member]
    
Current assets 28,562,501 22,257,619
Total assets 32,432,098 26,442,929
Current liabilities 10,520,057 8,172,750
Noncurrent liabilities 3,959,250 3,644,493
Joint ventures’ equity 17,952,791 14,625,686
Northern Technologies International Corporation’s share of joint ventures’ equity 8,776,830 6,840,579
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings 6,767,118 5,184,101
NTI ASEAN [Member]
    
Current assets   15,358,967
Total assets   15,522,456
Current liabilities   5,763,857
Noncurrent liabilities   1,055,965
Joint ventures’ equity   8,702,634
Northern Technologies International Corporation’s share of joint ventures’ equity   3,685,404
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings   $ 3,314,445