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Fair value of financial instruments (Details) - CAD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Financial assets measured at fair value      
Equities $ 5,236 $ 1,752 $ (8,694)
Financial assets not measured at fair value      
Cash and cash equivalents 12,119 10,417 $ 20,439
Current (terms of one year or less) 54,978 69,949  
Non-Current (terms exceeding one year) 1,135 34,726  
Financial liabilities not measured at fair value      
Accounts payable and accruals 7,843 11,254  
Credit facilities 37,644 76,472  
Debentures 40,658 44,039  
Convertible debentures 8,751 12,373  
Level 1 [Member]      
Financial assets not measured at fair value      
Cash and cash equivalents 12,119 10,417  
Level 2 [Member]      
Financial assets measured at fair value      
Equities 154 99  
Financial assets not measured at fair value      
Current (terms of one year or less) 54,978 69,647  
Financial liabilities not measured at fair value      
Accounts payable and accruals 7,843 11,254  
Credit facilities 37,644 76,472  
Debentures 40,658 44,867  
Convertible debentures 8,751 12,373  
Level 3 [Member]      
Financial assets measured at fair value      
Equities 18,291 20,491  
Partnership interest and other   200  
Financial assets not measured at fair value      
Non-Current (terms exceeding one year) 1,064 34,396  
Total Fair Value [Member]      
Financial assets measured at fair value      
Equities 18,445 20,590  
Partnership interest and other   200  
Financial assets not measured at fair value      
Cash and cash equivalents 12,119 10,417  
Current (terms of one year or less) 54,978 69,647  
Non-Current (terms exceeding one year) 1,064 34,396  
Financial liabilities not measured at fair value      
Accounts payable and accruals 7,843 11,254  
Credit facilities 37,644 76,472  
Debentures 40,658 44,867  
Convertible debentures 8,751 12,373  
Mandatorily at FVTPL [Member]      
Financial assets measured at fair value      
Equities 18,445 20,590  
Partnership interest and other   200  
Total financial assets measured at fair value 18,445 20,790  
Financial asset at amortized cost [Member]      
Financial assets not measured at fair value      
Cash and cash equivalents 12,119 10,417  
Current (terms of one year or less) 54,978 69,949  
Non-Current (terms exceeding one year) 1,135 34,726  
Total financial assets not measured at fair value 68,232 115,092  
Other Financial Liabilities [Member]      
Financial liabilities not measured at fair value      
Accounts payable and accruals 7,843 11,254  
Credit facilities 37,644 76,472  
Debentures 40,658 44,039  
Convertible debentures 8,751 12,373  
Total Financial liabilities not measured at fair value 94,896 144,138  
Total Carrying Value [Member]      
Financial assets measured at fair value      
Equities 18,445 20,590  
Partnership interest and other   200  
Total financial assets measured at fair value 18,445 20,790  
Financial assets not measured at fair value      
Cash and cash equivalents 12,119 10,417  
Current (terms of one year or less) 54,978 69,949  
Non-Current (terms exceeding one year) 1,135 34,726  
Total financial assets not measured at fair value 68,232 115,092  
Financial liabilities not measured at fair value      
Accounts payable and accruals 7,843 11,254  
Credit facilities 37,644 76,472  
Debentures 40,658 44,039  
Convertible debentures 8,751 12,373  
Total Financial liabilities not measured at fair value $ 94,896 $ 144,138