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Short-term investments (Narrative) (Details) - CAD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Short Term Investments [Line Items]    
Short-term investment $ 20,704 $ 10,000
Secured senior loan [Member]    
Short Term Investments [Line Items]    
Short-term investment $ 15,900 $ 10,000
Interest rate, investment 7.00%  
Notes receivable [Member]    
Short Term Investments [Line Items]    
Short-term investment $ 4,800  
Notes receivable [Member] | Minimum [Member]    
Short Term Investments [Line Items]    
Interest rate, investment 10.50%  
Notes receivable [Member] | Maximum [Member]    
Short Term Investments [Line Items]    
Interest rate, investment 12.00%