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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]
   
Three months ended June 30,
    
Six months ended June 30,
  
   
2018
    
 
2017
    
 
2018
    
 
2017
  
                                 
Numerator for basic and diluted earnings per common share:
                                
Net income for the period
   $
3,608
     $
5,242
     $
7,352
     $
7,686
  
                                 
Denominator for basic and diluted earnings per common share:
                                
Basic weighted average number of common shares outstanding
    
10,597,228
      
10,528,219
      
10,592,994
      
10,501,407
  
Effect of outstanding stock options
    
205,779
      
264,812
      
204,023
      
284,278
  
Diluted weighted average number of shares outstanding
    
10,803,007
      
10,793,031
      
10,797,017
      
10,785,685
  
                                 
Basic earnings per common share
   $
0.34
     $
0.50
     $
0.69
     $
0.73
  
                                 
Diluted earnings per common share
   $
0.33
     $
0.49
     $
0.68
     $
0.71