Financial instruments and risk management (Details) - Derivative Warrant Liability - Level 3 of fair value hierarchy - USD ($) |
12 Months Ended | |
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Dec. 31, 2024 |
Dec. 31, 2023 |
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| Financial instruments and risk management | ||
| Carrying value | $ 572,000 | $ 531,000 |
| Fair value | $ 572,000 | $ 531,000 |
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