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Nature and extent of risk arising from financial instruments (Details 1)
$ in Thousands, $ in Thousands
Dec. 31, 2020
CAD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
CAD ($)
Dec. 31, 2019
USD ($)
Disclosure Of Financial Instruments [Line Items]        
Cash $ 12,119   $ 10,417  
Debentures $ (12,621)   $ (12,621)  
Foreign Currency Risk [Member]        
Disclosure Of Financial Instruments [Line Items]        
Cash   $ 107   $ 322
Investment portfolio   6,171   7,060
Debentures   $ (5,105)   $ (5,020)