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Note 16 - Net Earnings Per Common Share
12 Months Ended
Dec. 31, 2018
Notes to Financial Statements  
Earnings Per Share [Text Block]
16.
Net earnings per common share
 
The following table reconciles the denominator used to calculate earnings per common share:
 
    2018     2017  
             
Shares issued and outstanding at beginning of period    
38,934,161
     
38,648,461
 
Weighted average number of shares: Issued during the period    
221,293
     
181,523
 
Weighted average number of shares used in computing basic earnings per share    
39,155,454
     
38,829,984
 
Assumed exercise of stock options acquired under the Treasury Stock Method    
639,161
     
477,870
 
Number of shares used in computing diluted earnings per share    
39,794,615
     
39,307,854