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Shareholders Equity - Stock-based payments - Exercise price (Details)
 12 Months Ended
Dec. 31, 2022
EquityInstruments
$ / shares
Dec. 31, 2021
EquityInstruments
Dec. 31, 2020
EquityInstruments
Shareholders' equity      
Options outstanding 724,653 822,046 745,962
Options exercisable 584,522 664,589  
Weighted average life 5 years 5 months 8 days    
C$40.87      
Shareholders' equity      
Exercise price | $ / shares $ 40.87    
Options outstanding 28,056    
Options exercisable 28,056    
Weighted average life 11 months 8 days    
C$46.17      
Shareholders' equity      
Exercise price | $ / shares $ 46.17    
Options outstanding 37,500    
Options exercisable 37,500    
Weighted average life 7 months 17 days    
C$58.67      
Shareholders' equity      
Exercise price | $ / shares $ 58.67    
Options outstanding 20,000    
Options exercisable 20,000    
Weighted average life 2 years 7 months 20 days    
C$59.52      
Shareholders' equity      
Exercise price | $ / shares $ 59.52    
Options outstanding 31,795    
Options exercisable 31,795    
Weighted average life 1 year 11 months 12 days    
C$65.76      
Shareholders' equity      
Exercise price | $ / shares $ 65.76    
Options outstanding 55,353    
Options exercisable 55,353    
Weighted average life 2 years 11 months 12 days    
C$75.45      
Shareholders' equity      
Exercise price | $ / shares $ 75.45    
Options outstanding 119,574    
Options exercisable 119,574    
Weighted average life 3 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 5 years 7 months 20 days    
C$94.57      
Shareholders' equity      
Exercise price | $ / shares $ 94.57    
Options outstanding 59,221    
Options exercisable 59,221    
Weighted average life 5 years 11 months 12 days    
C$100.10      
Shareholders' equity      
Exercise price | $ / shares $ 100.10    
Options outstanding 56,470    
Options exercisable 56,470    
Weighted average life 4 years 11 months 8 days    
C$129.32      
Shareholders' equity      
Exercise price | $ / shares $ 129.32    
Options outstanding 77,408    
Options exercisable 77,408    
Weighted average life 6 years 11 months 12 days    
C$168.43      
Shareholders' equity      
Exercise price | $ / shares $ 168.43    
Options outstanding 64,996    
Options exercisable 13,000    
Weighted average life 8 years 11 months 8 days    
C$168.72      
Shareholders' equity      
Exercise price | $ / shares $ 168.72    
Options outstanding 7,968    
Weighted average life 9 years 7 months 20 days    
C$171.33      
Shareholders' equity      
Exercise price | $ / shares $ 171.33    
Options outstanding 61,594    
Options exercisable 41,063    
Weighted average life 7 years 11 months 12 days    
C$178.01      
Shareholders' equity      
Exercise price | $ / shares $ 178.01    
Options outstanding 8,030    
Weighted average life 9 years 4 months 17 days    
C$181.57      
Shareholders' equity      
Exercise price | $ / shares $ 181.57    
Options outstanding 29,470    
Weighted average life 9 years 4 months 13 days    
C$185.70      
Shareholders' equity      
Exercise price | $ / shares $ 185.70    
Options outstanding 2,299    
Weighted average life 9 years 10 months 17 days    
C$194.65      
Shareholders' equity      
Exercise price | $ / shares $ 194.65    
Options outstanding 19,837    
Weighted average life 9 years 11 months 12 days