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Note 17 - Net Earnings Per Common Share
 12 Months Ended
Dec. 31, 2020
Notes to Financial Statements  
Earnings Per Share [Text Block]
17.
Net earnings per common share
 
The following table reconciles the denominator used to calculate earnings per common share:
 
    2020   2019
         
Shares issued and outstanding at beginning of period    
41,495,957
      
35,980,047
  
Weighted average number of shares:                
Issued during the period    
1,260,042
      
2,245,229
  
Weighted average number of shares used in computing basic earnings per share    
42,755,999
      
38,225,276
  
Assumed exercise of stock options, net of shares assumed acquired under the Treasury Stock Method    
428,098
      
437,204
  
Number of shares used in computing diluted earnings per share    
43,184,097
      
38,662,480