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Note 9 - Net Income Per Common Share (Tables)
12 Months Ended
Aug. 31, 2018
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Numerator:   August 31, 2018   August 31, 2017
Net income attributable to NTIC   $
6,701,366
    $
3,422,126
 
                 
Denominator:                
Basic-weighted shares outstanding    
4,538,838
     
4,528,611
 
Weighted shares assumed upon exercise of stock options    
146,364
     
48,748
 
Diluted – weighted shares outstanding    
4,685,202
     
4,577,359
 
                 
Basic earnings per share:   $
1.48
    $
0.76
 
Diluted earnings per share:   $
1.43
    $
0.75