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Note 5 - Environmental and Reclamation Activities - Liabilities Accrued for Reclamation and Closure Costs (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Reclamation and closure costs | $ 116,048 | $ 108,374 | $ 108,389 | $ 86,045
Reclamation and closure costs, current | (5,582) | (4,581) |  |
Reclamation and closure costs, long-term | 110,466 | 103,793 |  |
Operating Properties [Member] | Greens Creek [Member] |  |  |  |
Reclamation and closure costs | 42,716 | 44,695 |  |
Operating Properties [Member] | Lucky Friday [Member] |  |  |  |
Reclamation and closure costs | 12,818 | 10,473 |  |
Operating Properties [Member] | Casa Berardi [Member] |  |  |  |
Reclamation and closure costs | 11,730 | 4,510 |  |
Operating Properties [Member] | San Sebastian [Member] |  |  |  |
Reclamation and closure costs | 6,882 | 7,399 |  |
Operating Properties [Member] | Nevada Operations [Member] |  |  |  |
Reclamation and closure costs | 26,062 | 24,754 |  |
Non-Operating Properties [Member] | Troy Mine [Member] |  |  |  |
Reclamation and closure costs | 5,340 | 6,069 |  |
Non-Operating Properties [Member] | Johnny M Mine Area near San Mateo, New Mexico [Member] |  |  |  |
Reclamation and closure costs | 6,065 | 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 | $ 2,935 | $ 2,909 |  |

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