Note 5 - Environmental and Reclamation Activities - Schedule of Reclamation and Closure Costs Activities (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Environmental and Reclamation Activities [Abstract] | |||
| Beginning balance | $ 107,906 | $ 109,302 | $ 105,647 |
| Accruals for estimated costs | 17,647 | 816 | 4,643 |
| Accretion expense | 6,157 | 6,285 | 6,217 |
| Payment of reclamation obligations | (5,424) | (8,497) | (7,205) |
| Ending balance | $ 126,286 | $ 107,906 | $ 109,302 |
| X | ||||||||||
- Definition Amount of accretion expense related to accrual for environmental loss contingencies. No definition available.
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| X | ||||||||||
- Definition Accruals For Estimated Costs No definition available.
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| X | ||||||||||
- Definition Environmental and Reclamation Activities [Abstract] No definition available.
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| X | ||||||||||
- Definition Total costs accrued as of the balance sheet date for environmental loss contingencies. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Amount of cash outflow to settle environmental loss contingencies. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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