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Note 6 - Investments in Joint Ventures (Tables)
 12 Months Ended
Aug. 31, 2018
Notes Tables  
Condensed Balance Sheet [Table Text Block]
    As of August 31, 2018
    Total   EXCOR   All Other
Current assets   $
58,086,747
     $
27,354,788
     $
30,731,959
  
Total assets    
62,803,261
      
30,033,750
      
32,769,511
  
Current liabilities    
15,991,886
      
4,535,954
      
11,455,932
  
Noncurrent liabilities    
403,653
      
—
      
403,653
  
Joint ventures’ equity    
46,407,722
      
25,497,796
      
20,909,926
  
Northern Technologies International Corporation’s share of joint ventures’ equity    
22,950,995
      
12,748,899
      
10,195,263
  
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings   $
20,921,783
     $
12,717,994
     $
8,203,789
  
    As of August 31, 2017
    Total   EXCOR   All Other
Current assets   $
51,518,210
     $
22,142,514
     $
29,375,696
  
Total assets    
55,633,891
      
24,301,194
      
31,332,697
  
Current liabilities    
15,118,074
      
4,469,567
      
10,648,507
  
Noncurrent liabilities    
181,210
      
—
      
181,210
  
Joint ventures’ equity    
40,334,607
      
19,831,627
      
20,502,980
  
Northern Technologies International Corporation’s share of joint ventures’ equity    
20,035,074
      
9,915,816
      
10,119,258
  
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings   $
17,960,860
     $
9,884,911
     $
8,075,949
  
Condensed Income Statement [Table Text Block]
    Fiscal Year Ended August 31, 2018
    Total   EXCOR   All Other
Net sales   $
120,060,897
     $
47,537,949
     $
72,522,948
  
Gross profit    
53,348,459
      
25,584,666
      
27,763,793
  
Net income    
15,300,276
      
11,095,523
      
4,204,753
  
Northern Technologies International Corporation’s share of equity in income of joint ventures    
7,527,383
      
5,549,765
      
1,977,618
  
Northern Technologies International Corporation’s dividends received from joint ventures   $
3,697,503
     $
2,357,544
     $
1,339,959
  
    Fiscal Year Ended August 31, 2017
    Total   EXCOR   All Other
Net sales   $
101,261,132
     $
39,849,757
     $
61,411,375
  
Gross profit    
44,861,300
      
21,133,632
      
23,727,668
  
Net income    
11,839,933
      
8,369,728
      
3,470,205
  
Northern Technologies International Corporation’s share of equity in income of joint ventures    
5,898,908
      
4,185,988
      
1,712,920
  
Northern Technologies International Corporation’s dividends received from joint ventures   $
6,377,054
     $
5,379,062
     $
997,992