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Note 12 - Net Income Per Share (Tables)
 3 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
For the Three
Months Ended
December 31, 2019
    
For the Three
Months Ended
December 31, 2018
  
Net Income
   $
1,045,000
     $
1,275,000
  
                 
Basic earnings per common share
   $
0.16
     $
0.19
  
                 
                 
Diluted earnings per common share
   $
0.16
     $
0.19
  
                 
Weighted average number of common shares outstanding:
                
Basic
    
6,567,765
      
6,685,415
  
Dilutive effect of stock options
    
68,333
      
307
  
Diluted
    
6,636,098
      
6,685,722