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Note 13 - Net Earnings Per Common Share
 12 Months Ended
Dec. 31, 2016
Notes to Financial Statements  
Earnings Per Share [Text Block]
13.
Net earnings per common share
 
The following table reconciles the denominator used to calculate earnings per common share:
 
   
2016
  
2015
         
Shares issued and outstanding at beginning of period
    
35,939,011
      
35,970,605
  
Weighted average number of shares:
                
Issued during the period
    
72,023
      
129,867
  
Repurchased during the period
    
(45,247
)
    
(87,214
)
Weighted average number of shares used in computing basic earnings per share
    
35,965,787
      
36,013,258
  
Assumed exercise of stock options, net of shares assumed acquired under the Treasury Stock Method
    
399,997
      
411,769
  
Number of shares used in computing diluted earnings per share
    
36,365,784
      
36,425,027