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Note 5 - Net Income (Loss) Per Share of Common Stock (Tables)
 6 Months Ended
May 31, 2021
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
For the Three Months Ended
  
   
May 31, 2021
    
May 31, 2020
  
Numerator for basic and diluted net income (loss) per share:
                
                 
Net income (loss)
   $
64,090
     $
(801,720
 )
                 
Denominator:
                
For basic net income (loss) per share - weighted average common shares outstanding
    
4,522,514
      
4,401,754
  
Effect of dilutive stock options
    
-
      
-
  
For diluted net income (loss) per share - weighted average common shares outstanding
    
4,522,514
      
4,401,754
  
                 
                 
Net Income (Loss) per share - Basic:
                
Net Income (Loss) per share
   $
0.01
     $
(0.18
 )
                 
Net Income (Loss) per share - Diluted:
                
Net Income (Loss) per share
   $
0.01
     $
(0.18
 )
   
For the Six Months Ended
  
   
May 31, 2021
    
May 31, 2020
  
Numerator for basic and diluted net income (loss) per share:
                
                 
Net income (loss)
   $
(251,148
 )   $
(1,238,913
 )
                 
Denominator:
                
For basic net income (loss) per share - weighted average common shares outstanding
    
4,498,687
      
4,358,982
  
Effect of dilutive stock options
    
-
      
-
  
For diluted net income (loss) per share - weighted average common shares outstanding
    
4,498,687
      
4,358,982
  
                 
                 
Net Income (Loss) per share - Basic:
                
Net Income (Loss) per share
   $
(0.06
 )   $
(0.28
 )
                 
Net Income (Loss) per share - Diluted:
                
Net Income (Loss) per share
   $
(0.06
 )   $
(0.28
 )