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Financial instruments and risk management - Trade receivables (Details) - CAD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Not past due $ 31,923,000 $ 31,531,000
Past due 1-30 days 6,190,000 19,209,000
Past due 31-60 days 1,174,000 1,250,000
More than 61 days 710,000 164,000
Total 39,997,000 52,154,000
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