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Note 9 - Basic and Diluted Earnings Per Common Share (Tables)
 9 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
For the Three Months Ended
    
For the Nine Months Ended
  
   
September 30,
    
September 30,
  
   
2017
    
2016
    
2017
    
2016
  
Net income (numerator)
   $
1,103,000
     $
1,019,000
     $
2,457,000
     $
2,323,000
  
                                 
Shares (denominator):
                                
Basic weighted average common shares outstanding
    
14,732,173
      
16,695,059
      
14,962,606
      
17,190,073
  
Add: dilutive effect of common stock options
    
201,253
      
11,473
      
113,334
      
-
  
                                 
Diluted weighted average common shares outstanding
    
14,933,426
      
16,706,532
      
15,075,940
      
17,190,073
  
                                 
Earnings per common share:
                                
Basic
   $
0.07
     $
0.06
     $
0.16
     $
0.14
  
Diluted
   $
0.07
     $
0.06
     $
0.16
     $
0.14