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Financial instruments and risk management - Trade receivables (Details) - CAD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Not past due $ 21,725,000 $ 35,409,000
Past due 1-30 days 1,821,000 10,380,000
Past due 31-60 days 85,000 5,000
More than 61 days 125,000 44,000
Total 23,756,000 45,838,000
Allowance for doubtful accounts $ 0 $ 0
Minimum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Payment terms 15 days  
Maximum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Payment terms 60 days