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Note 17 - Earnings Per Common Share (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Year ended December 31,
  
   
2019
    
2018
    
2017
  
                         
Numerator for basic and diluted earnings per common share:
                        
Net income for the period
   $
15,398
     $
17,135
     $
22,327
  
                         
Denominator for basic and diluted earnings per common share:
                        
Basic weighted average number of common shares outstanding
    
10,623,799
      
10,604,722
      
10,537,356
  
Effect of outstanding stock options
    
149,013
      
189,448
      
256,266
  
Diluted weighted average number of shares outstanding
    
10,772,812
      
10,794,170
      
10,793,622
  
                         
Basic earnings per common share
   $
1.45
     $
1.62
     $
2.12
  
                         
Diluted earnings per common share
   $
1.43
     $
1.59
     $
2.07