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Note 5 - Environmental and Reclamation Activities - Liabilities Accrued for Reclamation and Closure Costs (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Reclamation and closure costs | $ 113,231 | $ 116,048 | $ 108,374 | $ 108,389
Reclamation and closure costs, current | (9,259) | (5,582) |  |
Reclamation and closure costs, long-term | 103,972 | 110,466 |  |
Operating Properties [Member] | Greens Creek [Member] |  |  |  |
Reclamation and closure costs | 37,474 | 42,716 |  |
Operating Properties [Member] | Lucky Friday [Member] |  |  |  |
Reclamation and closure costs | 13,543 | 12,818 |  |
Operating Properties [Member] | Casa Berardi [Member] |  |  |  |
Reclamation and closure costs | 12,497 | 11,730 |  |
Operating Properties [Member] | Nevada Operations [Member] |  |  |  |
Reclamation and closure costs | 27,068 | 26,062 |  |
Operating Properties [Member] | San Sebastian [Member] |  |  |  |
Reclamation and closure costs | 4,451 | 6,882 |  |
Non-Operating Properties [Member] | Troy Mine [Member] |  |  |  |
Reclamation and closure costs | 4,813 | 5,340 |  |
Non-Operating Properties [Member] | Johnny M Mine Area near San Mateo, New Mexico [Member] |  |  |  |
Reclamation and closure costs | 8,947 | 6,065 |  |
Non-Operating Properties [Member] | Republic [Member] |  |  |  |
Reclamation and closure costs | 1,500 | 1,500 |  |
Non-Operating Properties [Member] | All Other Sites [Member] |  |  |  |
Reclamation and closure costs | $ 2,938 | $ 2,935 |  |

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