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Investments - Investment in convertible debentures & uranium (Details) | 12 Months Ended |
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Dec. 31, 2024 CAD ($) lb | Dec. 31, 2024 USD ($) lb $ / shares | Dec. 31, 2023 CAD ($) $ / shares | Dec. 31, 2024 USD ($) $ / shares
Investments [Line Items] |  |  |  |
Purchase of investment-convertible debenture | $ | $ 0 |  | $ 15,000,000 |
Physical uranium sold | lb | 100,000 | 100,000 |  |
Physical uranium hold | lb | 2,200,000 | 2,200,000 |  |
Physical Uranium Holdings Cost | $ 80,729,000 |  |  | $ 65,289,000
Physical Uranium Holdings Cost Per Price |  | $ 29.67 |  |
Physical uranium holdings market value | 231,088,000 | $ 160,600,000 |  |
Physical uranium holdings market value per pound |  |  |  | $ 73
Proceeds on disposal of investment - uranium | $ 13,598,000 | $ 10,000,000 | 19,901,000 |
Convertible Debentures |  |  |  |
Investments [Line Items] |  |  |  |
Purchase of investment-convertible debenture | $ |  |  | $ 15,000,000 |
Investments, coupon rate |  |  | 9.00% |
Investments, interest payment period |  |  | 5 years |
Investments, convertible to common shares, conversion price per share |  |  | $ 0.56 |
Investments, interest payable in common shares, percent |  |  | 33.33% |
Number of trading days considered for calculating volume weighted average share price |  |  | 20 days |

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