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Note 6 - Investments in Joint Ventures (Tables)
 9 Months Ended
May 31, 2016
Notes Tables  
Condensed Balance Sheet [Table Text Block]
    May 31, 2016
    Total   EXCOR   All Other
Current assets   $ 47,930,421     $ 22,433,723     $ 25,496,698  
Total assets     51,389,757       24,189,092       27,200,665  
Current liabilities     13,952,018       4,602,925       9,349,093  
Noncurrent liabilities     103,392       —       103,392  
Joint ventures’ equity     37,334,348       19,586,166       17,748,182  
Northern Technologies International Corporation’s share of joint ventures’ equity     18,604,871       9,793,085       8,811,786  
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings   $ 15,892,135     $ 9,416,694     $ 6,475,441  
    August 31, 2015
    Total   EXCOR   All Other
Current assets   $ 49,295,116     $ 22,620,323     $ 26,674,793  
Total assets     52,853,938       24,606,880       28,247,058  
Current liabilities     12,288,383       3,360,142       8,928,241  
Noncurrent liabilities     1,215,139       —       1,215,139  
Joint ventures’ equity     39,350,417       21,246,738       18,103,679  
Northern Technologies International Corporation’s share of joint ventures’ equity     20,544,238       11,571,361       8,972,877  
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings   $ 18,483,377     $ 11,540,456     $ 6,942,921  
Condensed Income Statement [Table Text Block]
    Nine Months Ended May 31, 2016
    Total   EXCOR   All Other
Net sales   $ 66,223,514     $ 25,314,260     $ 40,909,254  
Gross profit     29,745,795       13,512,404       16,233,391  
Net income     7,188,274       5,409,407       1,778,867  
Northern Technologies International Corporation’s share of equity in income of joint ventures   $ 3,600,884     $ 2,714,905     $ 885,979  
                         
    Nine Months Ended May 31, 2015
    Total   EXCOR   Tianjin
Zerust		   All Other
Net sales   $ 75,974,770     $ 27,580,051     $ 3,735,457     $ 44,659,262  
Gross profit     37,469,186       15,113,100       1,783,673       20,572,413  
Net income     9,634,318       6,334,009       265,648       3,034,661  
Northern Technologies International Corporation’s share of equity in income of joint ventures   $ 4,806,247     $ 3,152,489     $ 132,824     $ 1,520,934