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Consolidated Statements of Cash Flows Supplemental Disclosure - reconciliation of liabilities arising from financing activities (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Bonds Payable.      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Opening balance $ 35,538 $ 35,227 $ 38,053
Non-cash changes:      
Accretion 156 140 145
Cumulative translation adjustments 413 171 (2,971)
Ending balance 36,107 35,538 35,227
Lease liabilities.      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Opening balance 706 767 1,175
Cash flows (414) (378) (466)
Non-cash changes:      
Additions   295 84
Accretion 20 28 42
Cumulative translation adjustments 2 (6) (68)
Ending balance $ 314 $ 706 $ 767