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Note 5 - Environmental and Reclamation Activities - Liabilities Accrued for Reclamation and Closure Costs (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Reclamation and closure costs | $ 108,389 | $ 86,045 | $ 85,580 | $ 95,538
Reclamation and closure costs, current | (3,410) | (6,679) |  |
Reclamation and closure costs, long-term | 104,979 | 79,366 |  |
Operating Properties [Member] | Greens Creek [Member] |  |  |  |
Reclamation and closure costs | 41,839 | 41,677 |  |
Operating Properties [Member] | Lucky Friday [Member] |  |  |  |
Reclamation and closure costs | 10,698 | 9,911 |  |
Operating Properties [Member] | Casa Berardi [Member] |  |  |  |
Reclamation and closure costs | 5,843 | 6,729 |  |
Operating Properties [Member] | San Sebastian [Member] |  |  |  |
Reclamation and closure costs | 7,765 | 5,067 |  |
Operating Properties [Member] | Nevada Operations [Member] |  |  |  |
Reclamation and closure costs | 23,272 |  |  |
Non-Operating Properties [Member] | Troy Mine [Member] |  |  |  |
Reclamation and closure costs | 8,971 | 12,724 |  |
Non-Operating Properties [Member] | Johnny M Mine Area near San Mateo, New Mexico [Member] |  |  |  |
Reclamation and closure costs | 5,813 | 5,813 |  |
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 | $ 2,688 | $ 2,624 |  |

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