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Note 18 - Net Earnings (Loss) Per Common Share
 12 Months Ended
Dec. 31, 2016
Notes to Financial Statements  
Earnings Per Share [Text Block]
18.
Net earnings (loss) per common share
 
Earnings per share calculations cannot be anti-dilutive; therefore diluted shares are not used in the denominator when the numerator is in a loss position. The following table reconciles the denominator used to calculate earnings per common share:
 
   
2016
   2015   2014
   
 
        
Shares issued and outstanding at beginning of year  
 
38,504,311
 
    
35,806,955
      
35,801,732
  
Weighted average number of shares:  
 
 
 
                
Issued during the year  
 
91,754
 
    
1,389,361
      
335,253
  
Repurchased during the year  
 
-
 
    
-
      
(220,333
 )
Weighted average number of shares used in computing basic earnings per share  
 
38,596,065
 
    
37,196,316
      
35,916,652
  
Assumed exercise of stock options acquired under the treasury stock method  
 
271,771
 
    
389,937
      
392,326
  
Number of shares used in computing diluted earnings per share  
 
38,867,836
 
    
37,586,253
      
36,308,978