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Note 5 - Environmental and Reclamation Activities - Schedule of Reclamation and Closure Costs Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Environmental and Reclamation Activities [Line Items] |  |  |  |
Reclamation and closure costs | $ 120,457 | $ 116,999 | $ 113,231 | $ 116,048
Reclamation and closure costs, current | $ (9,660) | $ (8,591) |  |
Environmental Loss Contingency, Current, Statement of Financial Position [Extensible Enumeration] | Accrued Reclamation Costs, Current | Accrued Reclamation Costs, Current |  |
Reclamation and closure costs, long-term | $ 110,797 | $ 108,408 |  |
Environmental Loss Contingency, Noncurrent, Statement of Financial Position [Extensible Enumeration] | Mine Reclamation and Closing Liability, Noncurrent | Mine Reclamation and Closing Liability, Noncurrent |  |
Operating Properties [Member] | Greens Creek [Member] |  |  |  |
Environmental and Reclamation Activities [Line Items] |  |  |  |
Reclamation and closure costs | $ 39,893 | $ 37,212 |  |
Operating Properties [Member] | Lucky Friday [Member] |  |  |  |
Environmental and Reclamation Activities [Line Items] |  |  |  |
Reclamation and closure costs | 12,022 | 13,343 |  |
Operating Properties [Member] | Casa Berardi [Member] |  |  |  |
Environmental and Reclamation Activities [Line Items] |  |  |  |
Reclamation and closure costs | 11,157 | 11,352 |  |
Non-Operating Properties [Member] | Keno Hill [Member] |  |  |  |
Environmental and Reclamation Activities [Line Items] |  |  |  |
Reclamation and closure costs | $ 3,360 | $ 4,514 |  |
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration] | Employee-related Liabilities, Current | Employee-related Liabilities, Current |  |
Non-Operating Properties [Member] | Nevada Operations [Member] |  |  |  |
Environmental and Reclamation Activities [Line Items] |  |  |  |
Reclamation and closure costs | $ 30,539 | $ 28,171 |  |
Non-Operating Properties [Member] | San Sebastian [Member] |  |  |  |
Environmental and Reclamation Activities [Line Items] |  |  |  |
Reclamation and closure costs | 2,061 | 1,989 |  |
Non-Operating Properties [Member] | Troy Mine [Member] |  |  |  |
Environmental and Reclamation Activities [Line Items] |  |  |  |
Reclamation and closure costs | 5,238 | 6,980 |  |
Non-Operating Properties [Member] | Johnny M [Member] |  |  |  |
Environmental and Reclamation Activities [Line Items] |  |  |  |
Reclamation and closure costs | 10,148 | 8,961 |  |
Non-Operating Properties [Member] | All Other Sites [Member] |  |  |  |
Environmental and Reclamation Activities [Line Items] |  |  |  |
Reclamation and closure costs | $ 6,039 | $ 4,477 |  |

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