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Note 7 - Investments in Joint Ventures (Details) - Condensed Income Statement of EXCOR and NTI ASEAN, and All Other Joint Ventures: (USD $)
 12 Months Ended
Aug. 31, 2014
Aug. 31, 2013
Condensed Income Statements, Captions [Line Items]    
Net sales $ 118,848,890 $ 113,189,068
Gross profit 56,960,918 52,058,609
Net income 11,842,338 10,650,542
Northern Technologies International Corporation’s share of equity in income from joint ventures 5,920,603 5,237,711
EXCOR [Member]
    
Condensed Income Statements, Captions [Line Items]    
Net sales 39,944,812 36,476,544
Gross profit 21,045,091 19,470,322
Net income 7,906,693 7,009,897
Northern Technologies International Corporation’s share of equity in income from joint ventures 3,950,915 3,507,057
China [Member]
    
Condensed Income Statements, Captions [Line Items]    
Net sales 15,920,685  
Gross profit 7,463,168  
Net income 1,274,487  
Northern Technologies International Corporation’s share of equity in income from joint ventures 626,763  
All Other [Member]
    
Condensed Income Statements, Captions [Line Items]    
Net sales 62,983,393 61,551,235
Gross profit 28,452,659 25,434,891
Net income 2,661,158 2,482,650
Northern Technologies International Corporation’s share of equity in income from joint ventures 1,342,925 1,151,278
NTI ASEAN [Member]
    
Condensed Income Statements, Captions [Line Items]    
Net sales   15,161,289
Gross profit   7,153,395
Net income   1,157,995
Northern Technologies International Corporation’s share of equity in income from joint ventures   $ 579,376