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, 2019
Dec. 31, 2018
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Non-capital losses $ 77,389 $ 63,230
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 5,090
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 4,400
2034 [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Non-capital losses 3,680
2035 [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Non-capital losses 5,610
2036 [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Non-capital losses 4,830
2037 [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Non-capital losses 8,896
2038 [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Non-capital losses 12,623
2039 [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Non-capital losses $ 19,510