Financial instruments and risk management - Trade receivables (Details) - CAD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Fair Value Disclosures [Abstract]
Not past due	$ 61,443	$ 53,007
Past due 1-30 days	7,547	8,790
Past due 31-60 days	521	1,772
More than 61 days	691	2,180
Total	$ 70,202	$ 65,749

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481990/310-10-45-2

Name:	us-gaap_AccountsReceivableNetCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant