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Fair value of financial instruments (Details 1) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Statement Line Items [Line Items]    
Disposals $ (2,906) $ (1,044)
Unrealized exchange loss (363) (330)
Unrealized (loss) gain on investment portfolio   294
Level 3 [Member]    
Statement Line Items [Line Items]    
Opening balance of Level 3 investments 20,691  
Acquired in business combination with Difference   22,648
Addition 150  
Disposals   (2,100)
Repayment of debenture   (14)
Unrealized exchange loss (247) (118)
Unrealized (loss) gain on investment portfolio (2,303) 275
Balance of level 3 investments, end of year $ 18,291 $ 20,691