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Note 6 - Investments in Joint Ventures (Tables)
 3 Months Ended
Nov. 30, 2016
Notes Tables  
Condensed Balance Sheet [Table Text Block]
   
As of August 30, 2016
                     
   
TOTAL
   EXCOR  
INDIA
  
FINLAND
  
All Other
Current assets   $
48,922,924
     $
22,928,810
     $
4,027,016
     $
1,928,861
     $
20,038,237
  
Total assets    
52,407,026
      
24,733,340
      
4,352,573
      
2,211,392
      
21,109,721
  
Current liabilities    
12,433,700
      
3,485,213
      
1,097,231
      
546,506
      
7,304,730
  
Noncurrent liabilities    
100,783
      
—
      
6,382
      
—
      
94,401
  
Joint ventures’ equity    
39,872,543
      
21,248,109
      
3,248,960
      
1,664,886
      
13,710,588
  
Northern Technologies International Corporation’s share of joint ventures’ equity    
19,854,064
      
10,624,056
      
1,624,480
      
832,442
      
6,773,086
  
Northern Technologies International Corporation’s share of joint ventures’ undistributed earnings   $
17,779,912
     $
10,593,151
     $
759,658
     $
812,442
     $
5,614,661
  
Northern Technologies International Corporation's dividends received from joint ventures   $
5,503,314
     $
4,364,700
     $
326,023
     $
206,516
     $
606,075
  
Condensed Income Statement [Table Text Block]
    Three Months Ended November 30, 2016
                     
    Total   EXCOR  
INDIA
  
FINLAND
  
All Other
Net sales   $
24,200,447
     $
9,208,524
     $
1,614,470
     $
929,868
     $
12,447,585
  
Gross profit    
10,697,027
      
4,894,179
      
750,118
      
556,221
      
4,496,509
  
Net income    
2,408,008
      
1,856,338
      
49,061
      
144,302
      
358,307
  
Northern Technologies International Corporation’s share of equity in income of joint ventures   $
1,274,004
     $
928,169
     $
99,163
     $
72,151
     $
174,521
  
   
Three Months Ended November 30, 2015
                     
    Total   EXCOR  
INDIA
  
FINLAND
  
All Other
Net sales   $
21,871,209
     $
8,207,696
     $
1,469,977
     $
870,971
     $
11,322,565
  
Gross profit    
9,648,081
      
4,153,477
      
693,340
      
520,124
      
4,281,140
  
Net income    
1,961,922
      
1,536,247
      
85,741
      
113,300
      
226,634
  
Northern Technologies International Corporation’s share of equity in income of joint ventures   $
983,753
     $
768,123
     $
42,870
     $
56,650
     $
116,110