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

Financial instruments (Schedule of Fair Value of Financial Instruments) (Details)

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Financial instruments (Schedule of Fair Value of Financial Instruments) (Details) - CAD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about financial instruments [line items]      
Cash and cash equivalents $ 14,895 $ 14,909 $ 13,547
Amounts receivable 1,337 261  
Accounts payable and accrued liabilities 7,575 2,760  
Amounts due to directors 49 21  
Long-term debt 8,069 6,476  
Carrying value [Member]      
Disclosure of detailed information about financial instruments [line items]      
Cash and cash equivalents 14,895 14,909  
Amounts receivable 780 110  
Accounts payable and accrued liabilities 7,557 2,741  
Amounts due to directors 49 21  
Long-term debt 8,150 6,537  
Fair value [Member]      
Disclosure of detailed information about financial instruments [line items]      
Cash and cash equivalents 14,895 14,909  
Amounts receivable 780 110  
Accounts payable and accrued liabilities 7,557 2,741  
Amounts due to directors 49 21  
Long-term debt $ 8,150 $ 6,537