XML 120 R85.htm IDEA: XBRL DOCUMENT v3.20.4
Shareholders' equity - Stock-based payments - Exercise price (Details)
 12 Months Ended
Dec. 31, 2020
$ / shares
Dec. 31, 2020
EquityInstruments
Dec. 31, 2020
USD ($)
Dec. 31, 2019
EquityInstruments
Dec. 31, 2018
EquityInstruments
Shareholders' equity          
Options outstanding   745,962 745,962 836,427 1,015,409
Options exercisable   563,975 563,975 596,402  
Weighted average life 6 years 4 months 24 days        
C$40.87          
Shareholders' equity          
Exercise price | $ / shares $ 40.87        
Options outstanding     32,451    
Options exercisable     32,451    
Weighted average life 2 years 11 months 9 days        
C$42.43          
Shareholders' equity          
Exercise price | $ / shares $ 42.43        
Options outstanding     750    
Options exercisable     750    
Weighted average life 1 year 3 months        
C$46.17          
Shareholders' equity          
Exercise price | $ / shares $ 46.17        
Options outstanding     75,000    
Options exercisable     75,000    
Weighted average life 2 years 7 months 17 days        
C$55.58          
Shareholders' equity          
Exercise price | $ / shares $ 55.58        
Options outstanding     17,397    
Options exercisable     17,397    
Weighted average life 1 year 11 months 12 days        
C$58.67          
Shareholders' equity          
Exercise price | $ / shares $ 58.67        
Options outstanding     20,000    
Options exercisable     20,000    
Weighted average life 4 years 7 months 21 days        
C$59.52          
Shareholders' equity          
Exercise price | $ / shares $ 59.52        
Options outstanding     33,876    
Options exercisable     33,876    
Weighted average life 3 years 11 months 12 days        
C$65.76          
Shareholders' equity          
Exercise price | $ / shares $ 65.76        
Options outstanding     55,853    
Options exercisable     55,853    
Weighted average life 4 years 11 months 9 days        
C$75.45          
Shareholders' equity          
Exercise price | $ / shares $ 75.45        
Options outstanding     120,074    
Options exercisable     120,074    
Weighted average life 5 years 11 months 9 days        
C$88.76          
Shareholders' equity          
Exercise price | $ / shares $ 88.76        
Options outstanding     45,082    
Options exercisable     29,171    
Weighted average life 7 years 7 months 21 days        
C$94.57          
Shareholders' equity          
Exercise price | $ / shares $ 94.57        
Options outstanding     95,273    
Options exercisable     60,184    
Weighted average life 7 years 11 months 12 days        
C$100.10          
Shareholders' equity          
Exercise price | $ / shares $ 100.10        
Options outstanding     84,523    
Options exercisable     84,523    
Weighted average life 6 years 11 months 9 days        
C$129.32          
Shareholders' equity          
Exercise price | $ / shares $ 129.32        
Options outstanding     104,089    
Options exercisable     34,696    
Weighted average life 8 years 11 months 9 days        
C$171.33          
Shareholders' equity          
Exercise price | $ / shares $ 171.33        
Options outstanding     61,594    
Weighted average life 9 years 11 months 9 days