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Shareholders Equity - Stock-based payments - Exercise price (Details)
 12 Months Ended
Dec. 31, 2023
EquityInstruments
Dec. 31, 2023
$ / shares
Dec. 31, 2023
shares
Dec. 31, 2022
EquityInstruments
Dec. 31, 2021
EquityInstruments
Shareholders' equity          
Options outstanding 669,201   669,201 724,653 822,046
Options exercisable 570,572   570,572 584,522  
Weighted average life 4 years 8 months 15 days        
C$40.87          
Shareholders' equity          
Exercise price | $ / shares   $ 40.87      
Options outstanding     28,056    
Options exercisable     28,056    
Weighted average life 2 months 19 days        
C$58.67          
Shareholders' equity          
Exercise price | $ / shares   58.67      
Options outstanding     20,000    
Options exercisable     20,000    
Weighted average life 1 year 7 months 20 days        
C$59.52          
Shareholders' equity          
Exercise price | $ / shares   59.52      
Options outstanding     27,751    
Options exercisable     27,751    
Weighted average life 11 months 12 days        
C$65.76          
Shareholders' equity          
Exercise price | $ / shares   65.76      
Options outstanding     51,577    
Options exercisable     51,577    
Weighted average life 1 year 11 months 12 days        
C$75.45          
Shareholders' equity          
Exercise price | $ / shares   75.45      
Options outstanding     117,894    
Options exercisable     117,894    
Weighted average life 2 years 11 months 12 days        
C$88.76          
Shareholders' equity          
Exercise price | $ / shares   88.76      
Options outstanding     45,082    
Options exercisable     45,082    
Weighted average life 4 years 7 months 20 days        
C$94.57          
Shareholders' equity          
Exercise price | $ / shares   94.57      
Options outstanding     54,221    
Options exercisable     54,221    
Weighted average life 4 years 11 months 12 days        
C$100.10          
Shareholders' equity          
Exercise price | $ / shares   100.10      
Options outstanding     50,470    
Options exercisable     50,470    
Weighted average life 3 years 11 months 12 days        
C$129.32          
Shareholders' equity          
Exercise price | $ / shares   129.32      
Options outstanding     77,408    
Options exercisable     77,408    
Weighted average life 5 years 11 months 12 days        
C$164.99          
Shareholders' equity          
Exercise price | $ / shares   164.99      
Options outstanding     4,400    
Weighted average life 0 years        
C$168.43          
Shareholders' equity          
Exercise price | $ / shares   168.43      
Options outstanding     64,996    
Options exercisable     25,998    
Weighted average life 7 years 11 months 12 days        
C$168.72          
Shareholders' equity          
Exercise price | $ / shares   168.72      
Options outstanding     7,968    
Options exercisable     1,594    
Weighted average life 8 years 7 months 20 days        
C$171.33          
Shareholders' equity          
Exercise price | $ / shares   171.33      
Options outstanding     58,594    
Options exercisable     58,594    
Weighted average life 6 years 11 months 12 days        
C$178.01          
Shareholders' equity          
Exercise price | $ / shares   178.01      
Options outstanding     8,030    
Options exercisable     1,606    
Weighted average life 8 years 4 months 17 days        
C$181.57          
Shareholders' equity          
Exercise price | $ / shares   181.57      
Options outstanding     29,470    
Options exercisable     5,894    
Weighted average life 8 years 4 months 17 days        
C$185.70          
Shareholders' equity          
Exercise price | $ / shares   185.70      
Options outstanding     2,299    
Options exercisable     460    
Weighted average life 8 years 10 months 17 days        
C$188.13          
Shareholders' equity          
Exercise price | $ / shares   188.13      
Options outstanding     1,148    
Weighted average life 0 years        
C$194.65          
Shareholders' equity          
Exercise price | $ / shares   $ 194.65      
Options outstanding     19,837    
Options exercisable     3,967    
Weighted average life 8 years 11 months 12 days