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Note 6 - Investments in Joint Ventures (Details) - Condensed Income Statement of EXCOR and NTI ASEAN, and All Other Joint Ventures: (USD $)
 3 Months Ended
Nov. 30, 2013
Nov. 30, 2012
Condensed Income Statements, Captions [Line Items]    
Net sales $ 29,661,218 $ 27,524,934
Gross profit 14,166,070 13,127,067
Net income 2,837,565 2,440,560
Northern Technologies International Corporation’s share of equity in income of joint ventures 1,427,748 1,154,296
EXCOR [Member]
    
Condensed Income Statements, Captions [Line Items]    
Net sales 9,476,403 8,609,463
Gross profit 5,063,662 4,434,290
Net income 1,853,307 1,570,374
Northern Technologies International Corporation’s share of equity in income of joint ventures 926,654 785,187
China [Member]
    
Condensed Income Statements, Captions [Line Items]    
Net sales 4,294,138 3,568,798
Gross profit 2,016,809 1,730,402
Net income 298,708 294,003
Northern Technologies International Corporation’s share of equity in income of joint ventures 149,354 147,001
All Other [Member]
    
Condensed Income Statements, Captions [Line Items]    
Net sales 15,890,677 15,346,673
Gross profit 7,085,599 6,962,375
Net income 685,550 576,183
Northern Technologies International Corporation’s share of equity in income of joint ventures $ 351,740 $ 222,108