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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 9 Months Ended
May 31, 2013
May 31, 2012
May 31, 2013
May 31, 2012
Condensed Income Statements, Captions [Line Items]        
Net sales     $ 82,788,711 $ 83,746,872
Gross profit     39,447,084 40,201,265
Net income     7,626,711 8,165,791
Northern Technologies International Corporation’s share of equity in income of joint ventures 1,440,335 1,822,972 3,733,069 4,405,327
EXCOR [Member]
        
Condensed Income Statements, Captions [Line Items]        
Net sales     26,043,775 25,785,840
Gross profit     13,624,792 13,423,067
Net income     4,954,595 4,830,477
Northern Technologies International Corporation’s share of equity in income of joint ventures     2,478,109 2,396,596
China [Member]
        
Condensed Income Statements, Captions [Line Items]        
Net sales     10,802,206  
Gross profit     5,134,820  
Net income     815,664  
Northern Technologies International Corporation’s share of equity in income of joint ventures     407,809  
All Other [Member]
        
Condensed Income Statements, Captions [Line Items]        
Net sales     45,942,730 41,594,775
Gross profit     20,687,472 19,594,413
Net income     1,856,452 1,393,897
Northern Technologies International Corporation’s share of equity in income of joint ventures     847,151 932,501
NTI ASEAN [Member]
        
Condensed Income Statements, Captions [Line Items]        
Net sales       16,366,258
Gross profit       7,183,786
Net income       1,941,417
Northern Technologies International Corporation’s share of equity in income of joint ventures       $ 1,076,230