Note 5 - Environmental and Reclamation Activities - Schedule of Change in Asset Retirement Obligation (Details) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
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| Environmental and Reclamation Activities [Abstract] | ||
| Beginning Balance at January 1 | $ 107,906 | $ 109,302 |
| Changes in obligations due to changes in reclamation plans | 17,647 | 816 |
| Accretion expense | 6,157 | 6,285 |
| Payment of asset retirement obligations | (5,424) | (8,497) |
| Ending balance at December 31 | $ 126,286 | $ 107,906 |
| X | ||||||||||
- Definition Environmental and Reclamation Activities [Abstract] No definition available.
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| X | ||||||||||
- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of cash paid during the period to settle an asset retirement obligation. Amounts paid to settle an asset retirement obligation are generally included in the operating section of the Statement of Cash Flows. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of increase (decrease) in the asset retirement obligation from changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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