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Marketable Securities (Details) - CAD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
aug_MajorAssumptionsMadeConcerningFutureEventsOtherProvisionsInflationRate |  |
Marketable securities, beginning | $ 346 | $ 186
Additions, upon acquisition of Eastmain | 1,662 | 0
Additions | 102 | 0
Unrealized net gains | 565 | 160
Marketable securities, ending | $ 2,675 | $ 346

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