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Note 9 - Basic and Diluted Earnings Per Common Share (Tables)
 6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
For the Three Months Ended
    
For the Six Months Ended
  
   
June 30,
    
June 30,
  
   
2018
    
2017
    
2018
    
2017
  
Net income (numerator)
   $
959,000
     $
804,000
     $
1,467,000
     $
1,354,000
  
                                 
Shares (denominator):
                                
Basic weighted average common shares outstanding
    
14,086,277
      
14,953,217
      
14,151,734
      
15,079,733
  
Add: dilutive effect of common stock options
    
41,657
      
52,872
      
67,329
      
71,299
  
                                 
Diluted weighted average common shares outstanding
    
14,127,934
      
15,006,089
      
14,219,063
      
15,151,032
  
                                 
Earnings per common share:
                                
Basic
   $
0.07
     $
0.05
     $
0.10
     $
0.09
  
Diluted
   $
0.07
     $
0.05
     $
0.10
     $
0.09