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Note 4 - Environmental and Reclamation Activities - Liabilities Accrued for Reclamation and Closure Costs (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | --- | ---
Operating properties: |  |  |  |
Reclamation and closure costs | $ 85,580 | $ 95,538 | $ 57,250 | $ 105,191
Non-operating properties: |  |  |  |
Reclamation and closure costs | 85,580 | 95,538 | $ 57,250 | $ 105,191
Reclamation and closure costs, current | (5,653) | (20,989) |  |
Reclamation and closure costs, long-term | 79,927 | 74,549 |  |
Operating Properties [Member] | Greens Creek [Member] |  |  |  |
Operating properties: |  |  |  |
Reclamation and closure costs | 39,014 | 41,338 |  |
Non-operating properties: |  |  |  |
Reclamation and closure costs | 39,014 | 41,338 |  |
Operating Properties [Member] | Lucky Friday [Member] |  |  |  |
Operating properties: |  |  |  |
Reclamation and closure costs | 9,194 | 5,212 |  |
Non-operating properties: |  |  |  |
Reclamation and closure costs | 9,194 | 5,212 |  |
Operating Properties [Member] | Casa Berardi [Member] |  |  |  |
Operating properties: |  |  |  |
Reclamation and closure costs | 5,475 | 5,494 |  |
Non-operating properties: |  |  |  |
Reclamation and closure costs | 5,475 | 5,494 |  |
Operating Properties [Member] | San Sebastian [Member] |  |  |  |
Operating properties: |  |  |  |
Reclamation and closure costs | 5,425 | 1,189 |  |
Non-operating properties: |  |  |  |
Reclamation and closure costs | 5,425 | 1,189 |  |
Non-Operating Properties [Member] | Troy Mine [Member] |  |  |  |
Operating properties: |  |  |  |
Reclamation and closure costs | 16,167 | 17,295 |  |
Non-operating properties: |  |  |  |
Reclamation and closure costs | 16,167 | 17,295 |  |
Non-Operating Properties [Member] | South Dakota and Colorado Superfund Sites [Member] |  |  |  |
Operating properties: |  |  |  |
Reclamation and closure costs |  | 16,300 |  |
Non-operating properties: |  |  |  |
Reclamation and closure costs |  | 16,300 |  |
Non-Operating Properties [Member] | Johnny M Mine Area near San Mateo, New Mexico [Member] |  |  |  |
Operating properties: |  |  |  |
Reclamation and closure costs | 5,830 | 5,830 |  |
Non-operating properties: |  |  |  |
Reclamation and closure costs | 5,830 | 5,830 |  |
Non-Operating Properties [Member] | Republic [Member] |  |  |  |
Operating properties: |  |  |  |
Reclamation and closure costs | 1,500 | 774 |  |
Non-operating properties: |  |  |  |
Reclamation and closure costs | 1,500 | 774 |  |
Non-Operating Properties [Member] | All Other Sites [Member] |  |  |  |
Operating properties: |  |  |  |
Reclamation and closure costs | 2,975 | 2,106 |  |
Non-operating properties: |  |  |  |
Reclamation and closure costs | $ 2,975 | $ 2,106 |  |

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