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, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about financial instruments [line items]
Cash and cash equivalents $ 14,066 $ 14,895 $ 14,909
Amounts receivable 845 1,337
Accounts payable and accrued liabilities 6,157 7,575
Amounts due to directors 60 49
Long-term debt 8,373 8,069
Carrying value [Member]
Disclosure of detailed information about financial instruments [line items]
Cash and cash equivalents 14,066 14,895
Amounts receivable 439 780
Accounts payable and accrued liabilities 6,142 7,557
Amounts due to directors 60 49
Long-term debt 8,461 8,150
Fair value [Member]
Disclosure of detailed information about financial instruments [line items]
Cash and cash equivalents 14,066 14,895
Amounts receivable 439 780
Accounts payable and accrued liabilities 6,142 7,557
Amounts due to directors 60 49
Long-term debt $ 8,461 $ 8,150