Annual reports filed by certain Canadian issuers pursuant to Section 15(d) and Rule 15d-4

Deferred income taxes (Schedule of Non-Capital Losses) (Details)

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Deferred income taxes (Schedule of Non-Capital Losses) (Details) - CAD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Non-capital losses $ 63,230 $ 43,719
2025 [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Non-capital losses 1,000  
2026 [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Non-capital losses 1,100  
2027 [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Non-capital losses 1,470  
2028 [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Non-capital losses 1,770  
2029 [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Non-capital losses 660  
2030 [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Non-capital losses 2,640  
2031 [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Non-capital losses 5,180  
2032 [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Non-capital losses 4,110  
2033 [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Non-capital losses 4,270  
2034 [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Non-capital losses 3,400  
2035 [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Non-capital losses 7,560  
2036 [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Non-capital losses 5,100  
2037 [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Non-capital losses 6,700  
2038 [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Non-capital losses $ 18,270