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Note 17 - Net Earnings Per Common Share
 12 Months Ended
Dec. 31, 2017
Notes to Financial Statements  
Earnings Per Share [Text Block]
17.
Net earnings per common share
 
Earnings per share calculations cannot be anti-dilutive, therefore diluted shares are
not
used in the denominator if the numerator is in a loss position. The following table reconciles the denominator used to calculate earnings per common share:
 
     
2017
       2016  
         
Shares issued and outstanding at beginning of period    
38,648,461
      
38,504,311
  
Weighted average number of shares:    
 
          
Issued during the period    
181,523
      
91,754
  
Weighted average number of shares used in computing basic earnings per share    
38,829,984
      
38,596,065
  
Assumed exercise of stock options acquired under the Treasury Stock Method    
477,870
      
271,771
  
Number of shares used in computing diluted earnings per share    
39,307,854
      
38,867,836