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Note 9 - Net Income Per Common Share (Tables)
6 Months Ended
Feb. 28, 2019
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
    Three Months Ended   Six Months Ended
Numerators:   February 28, 2019   February 28, 2018   February 28, 2019   February 28, 2018
Net income attributable to NTIC   $
1,401,568
    $
1,332,847
    $
2,898,627
    $
2,416,473
 
Denominators:                                
Basic – weighted shares outstanding    
4,542,177
     
4,537,408
     
4,542,175
     
4,537,368
 
Weighted shares assumed upon exercise of stock options    
181,753
     
135,930
     
189,433
     
103,674
 
Diluted – weighted shares outstanding    
4,723,930
     
4,673,338
     
4,731,608
     
4,641,042
 
Basic net income per share:   $
0.31
    $
0.29
    $
0.64
    $
0.53
 
Diluted net income per share:   $
0.30
    $
0.29
    $
0.61
    $
0.52