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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 $)
Feb. 28, 2013
Aug. 31, 2012
Current assets $ 61,997,739 $ 61,973,725
Total assets 68,522,275 68,585,974
Current liabilities 19,532,691 18,686,181
Noncurrent liabilities 4,210,364 4,700,458
Joint ventures’ equity 44,779,219 45,199,335
Northern Technologies International Corporation’s share of joint ventures’ equity 22,189,562 21,461,492
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings 20,075,092 19,403,150
EXCOR [Member]
    
Current assets 22,196,110 24,357,139
Total assets 24,625,927 26,620,589
Current liabilities 3,848,126 4,749,574
Joint ventures’ equity 20,777,801 21,871,015
Northern Technologies International Corporation’s share of joint ventures’ equity 10,388,902 10,935,509
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings 10,357,997 10,904,604
China [Member]
    
Current assets 12,442,364  
Total assets 12,474,170  
Current liabilities 5,094,516  
Noncurrent liabilities 856,978  
Joint ventures’ equity 6,522,675  
Northern Technologies International Corporation’s share of joint ventures’ equity 3,261,338  
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings 3,215,436  
All Other [Member]
    
Current assets 27,359,265 22,257,619
Total assets 31,422,178 26,442,929
Current liabilities 10,590,049 8,172,750
Noncurrent liabilities 3,353,386 3,644,493
Joint ventures’ equity 17,478,742 14,625,686
Northern Technologies International Corporation’s share of joint ventures’ equity 8,539,322 6,840,579
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings 6,501,659 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