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Financial instruments and risk management - Financial instruments (Details) - CAD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Level 1 | Carrying Amount | Convertible debentures |  |
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Long-term debt | $ 129,106 | $ 129,750
Level 1 | Fair Value | Convertible debentures |  |
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Long-term debt | 168,949 | 160,072
Level 2 | Carrying Amount | Financing obligations |  |
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Long-term debt | 197,018 | 162,266
Level 2 | Carrying Amount | Mortgage |  |
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Long-term debt | 27,600 | 28,429
Level 2 | Fair Value | Financing obligations |  |
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Long-term debt | 196,240 | 159,900
Level 2 | Fair Value | Mortgage |  |
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Long-term debt | $ 23,993 | $ 22,780

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