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Note 6 - Investments in Joint Ventures (Detail) - Condensed Income Statement of EXCOR and NTI ASEAN, and All Other Joint Ventures: (USD $)
 12 Months Ended
Aug. 31, 2012
Aug. 31, 2011
Net sales $ 111,830,961 $ 119,276,553
Gross profit 50,679,875 54,135,274
Net income 11,987,323 12,221,658
Northern Technologies International Corporation’s share of equity in income of joint ventures 5,519,795 5,536,243
EXCOR [Member]
    
Net sales 36,027,979 39,038,653
Gross profit 18,667,848 19,080,420
Net income 6,656,298 6,804,175
Northern Technologies International Corporation’s share of equity in income of joint ventures 3,318,213 3,274,333
NTI ASEAN [Member]
    
Net sales 22,035,035 18,938,928
Gross profit 9,621,930 8,812,415
Net income 3,585,476 3,147,978
Northern Technologies International Corporation’s share of equity in income of joint ventures 1,414,248 1,212,250
All Other [Member]
    
Net sales 53,767,947 61,298,972
Gross profit 22,390,097 26,242,439
Net income 1,745,549 2,269,505
Northern Technologies International Corporation’s share of equity in income of joint ventures $ 787,333 $ 1,049,660