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Note 10 - Net Income (Loss) Per Common Share (Tables)
 12 Months Ended
Aug. 31, 2017
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Numerator:   August 31, 2017   August 31, 2016
Net income (loss) attributable to NTIC   $
3,422,126
     $
(867,514
 )
                 
Denominator:                
Basic-weighted shares outstanding    
4,528,611
      
4,537,504
  
Weighted shares assumed upon exercise of stock options    
48,748
      
—
  
Diluted – weighted shares outstanding    
4,577,359
      
4,537,504
  
                 
Basic income (loss) earnings per share:   $
0.76
     $
(0.19
 )
Diluted income (loss) earnings per share:   $
0.75
     $
(0.19
 )