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Note 9 - Basic and Diluted Earnings Per Common Share (Tables)
 9 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three months ended September 30,
    
Nine months ended September 30,
  
   
2018
    
2017
    
2018
    
2017
  
                                 
Numerator for basic and diluted earnings per common share:
                                
Net income for the period
   $
5,346
     $
3,440
     $
12,698
     $
11,128
  
                                 
Denominator for basic and diluted earnings per common share:
                                
Basic weighted average number of common shares outstanding
    
10,611,579
      
10,564,311
      
10,599,243
      
10,522,841
  
Effect of outstanding stock options
    
182,718
      
221,031
      
196,425
      
262,209
  
Diluted weighted average number of shares outstanding
    
10,794,297
      
10,785,342
      
10,795,668
      
10,785,050
  
                                 
Basic earnings per common share
   $
0.50
     $
0.33
     $
1.20
     $
1.06
  
                                 
Diluted earnings per common share
   $
0.50
     $
0.32
     $
1.18
     $
1.03