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Note 4 - Environmental and Reclamation Activities - Schedule of Reclamation and Closure Costs Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Environmental and Reclamation Activities [Line Items] |  |  |  |
Reclamation and closure costs | $ 116,999 | $ 113,231 | $ 116,048 | $ 108,374
Reclamation and closure costs, current | $ (8,591) | $ (9,259) |  |
Environmental Loss Contingency, Current, Statement of Financial Position [Extensible Enumeration] | Accrued Reclamation Costs, Current | Accrued Reclamation Costs, Current |  |
Reclamation and closure costs, long-term | $ 108,408 | $ 103,972 |  |
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 | $ 37,212 | $ 37,474 |  |
Operating Properties [Member] | Lucky Friday [Member] |  |  |  |
Environmental and Reclamation Activities [Line Items] |  |  |  |
Reclamation and closure costs | 13,343 | 13,543 |  |
Operating Properties [Member] | Casa Berardi [Member] |  |  |  |
Environmental and Reclamation Activities [Line Items] |  |  |  |
Reclamation and closure costs | 11,352 | 12,497 |  |
Operating Properties [Member] | Nevada Operations [Member] |  |  |  |
Environmental and Reclamation Activities [Line Items] |  |  |  |
Reclamation and closure costs | 28,171 | $ 27,068 |  |
Non-Operating Properties [Member] | Keno Hill [Member] |  |  |  |
Environmental and Reclamation Activities [Line Items] |  |  |  |
Reclamation and closure costs | $ 4,514 |  |  |
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration] | Employee-related Liabilities, Current | Employee-related Liabilities, Current |  |
Non-Operating Properties [Member] | San Sebastian [Member] |  |  |  |
Environmental and Reclamation Activities [Line Items] |  |  |  |
Reclamation and closure costs | $ 1,989 | $ 4,451 |  |
Non-Operating Properties [Member] | Troy Mine [Member] |  |  |  |
Environmental and Reclamation Activities [Line Items] |  |  |  |
Reclamation and closure costs | 6,980 | 4,813 |  |
Non-Operating Properties [Member] | Johnny M [Member] |  |  |  |
Environmental and Reclamation Activities [Line Items] |  |  |  |
Reclamation and closure costs | 8,961 | 8,947 |  |
Non-Operating Properties [Member] | All Other Sites [Member] |  |  |  |
Environmental and Reclamation Activities [Line Items] |  |  |  |
Reclamation and closure costs | $ 4,477 | $ 4,438 |  |

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