Intangible asset (Details) - CAD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Reconciliation of carrying amount [Line Items] | ||
| Intangible assets, beginning of year | $ 39,822 | |
| Intangible assets, end of year | 36,162 | $ 39,822 |
| Cost [Member] | ||
| Reconciliation of carrying amount [Line Items] | ||
| Intangible assets, beginning of year | 118,819 | 118,819 |
| Intangible assets, end of year | 118,819 | 118,819 |
| Accumulated amortization [Member] | ||
| Reconciliation of carrying amount [Line Items] | ||
| Intangible assets, beginning of year | (78,997) | (75,242) |
| Amortization charge | (3,660) | (3,755) |
| Intangible assets, end of year | $ (82,657) | $ (78,997) |