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Income Taxes - reconciliation of (loss) income before income taxes (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Income Taxes      
(Loss) income before income taxes $ (23,956) $ 17,547 $ 11,179
Computed recovery (expense) of income taxes 6,383 (5,982) (6,521)
Decrease (increase) in income taxes resulting from:      
Effect of change in income tax rate 0 0 (13)
Other non-taxable income 326 160 1
Revisions to prior years (1,064) 351 (21)
Capital gains and losses on dispositions, net (454) 83 35
Resource property revenue taxes (4,130) (5,758) (4,433)
Unrecognized losses in current year (330) (199) (1)
Previously unrecognized deferred income tax assets, net 927 302 113
Permanent differences (1,063) (262) (92)
Other non-taxable income   1,156  
Other, net (46) (27) (33)
Income tax recovery (expense) $ (549) $ 10,176 $ 10,967