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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 $)
 3 Months Ended 6 Months Ended
Feb. 28, 2013
Feb. 29, 2012
Feb. 28, 2013
Feb. 29, 2012
Net sales     $ 54,247,135 $ 54,792,662
Gross profit     25,852,537 25,945,925
Net income     4,728,680 4,798,435
Northern Technologies International Corporation’s share of equity in income of joint ventures 1,138,438 1,224,675 2,292,734 2,582,355
EXCOR [Member]
        
Net sales     17,451,153 16,958,519
Gross profit     9,105,579 8,860,381
Net income     3,260,575 3,158,682
Northern Technologies International Corporation’s share of equity in income of joint ventures     1,631,125 1,576,496
China [Member]
        
Net sales     6,929,260  
Gross profit     3,290,660  
Net income     524,546  
Northern Technologies International Corporation’s share of equity in income of joint ventures     262,148  
All Other [Member]
        
Net sales     29,866,722 27,351,999
Gross profit     13,456,298 12,380,147
Net income     943,559 363,697
Northern Technologies International Corporation’s share of equity in income of joint ventures     399,461 313,744
NTI ASEAN [Member]
        
Net sales       10,482,144
Gross profit       4,705,397
Net income       1,276,056
Northern Technologies International Corporation’s share of equity in income of joint ventures       $ 692,115