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Note 20 - Net Earnings Per Common Share (Tables)
12 Months Ended
Dec. 31, 2020
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
    Year ended December 31,
(in thousands of US dollars, except share information)     2020       2019  
                 
Net earnings attributable to Company   $
49,074
    $
102,903
 
Adjusted numerator under the If-Converted Method   $
49,074
    $
102,903
 
                 
                 
Shares issued and outstanding at beginning of period    
39,845,211
     
39,213,136
 
Weighted average number of shares:                
Issued during the period    
140,657
     
336,426
 
Weighted average number of shares used in computing basic earnings per share    
39,985,868
     
39,549,562
 
Assumed exercise of stock options acquired under the Treasury Stock Method    
193,296
     
431,456
 
Number of shares used in computing diluted earnings per share    
40,179,164
     
39,981,018