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Investment in Ambler Metals LLC - Financial information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
May 31, 2026 | May 31, 2025 | May 31, 2026 | May 31, 2025 | Nov. 30, 2025
Carrying value of investment in Ambler Metals |  |  |  |  |
Investment in Ambler Metals, Beginning |  |  | $ 105,263 |  |
Share of loss on equity investment | $ (2,334) | $ (764) | (3,677) | $ (1,345) |
Investment in Ambler Metals, Ending | 112,086 |  | 112,086 |  |
Assets [Abstract] |  |  |  |  |
Cash and cash equivalents | 38,838 |  | 38,838 |  | $ 51,613
Total assets | 151,195 |  | 151,195 |  | 157,304
Liabilities [Abstract] |  |  |  |  |
Total liabilities | 35,272 |  | 35,272 |  | 33,183
Equity Method Investment, Nonconsolidated Investee or Group of Investees |  |  |  |  |
Assets [Abstract] |  |  |  |  |
Cash and cash equivalents | 17,394 |  | 17,394 |  | 3,507
Mineral properties | 30,899 |  | 30,899 |  | 30,899
Other assets | 2,987 |  | 2,987 |  | 1,303
Total assets | 51,280 |  | 51,280 |  | 35,709
Liabilities [Abstract] |  |  |  |  |
Accounts payable and accrued liabilities | 2,543 |  | 2,543 |  | 961
Other liabilities | 359 |  | 359 |  | 16
Total liabilities | 2,902 |  | 2,902 |  | 977
Members' equity (total assets less total liabilities) | 48,378 |  | 48,378 |  | $ 34,732
Operating Income (Loss) [Abstract] |  |  |  |  |
Project costs |  |  | 4,938 |  |
Corporate costs |  |  | 2,368 |  |
Other items |  |  | 48 |  |
Comprehensive loss |  |  | 7,354 |  |
Ambler Metals LLC |  |  |  |  |
Carrying value of investment in Ambler Metals |  |  |  |  |
Investment in Ambler Metals, Beginning |  |  | 105,263 |  |
Joint venture equity contribution | 10,500 |  | 10,500 |  |
Share of loss on equity investment |  |  | (3,677) |  |
Investment in Ambler Metals, Ending | $ 112,086 |  | $ 112,086 |  |

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