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Note 4 - Environmental and Reclamation Activities (Tables) | 12 Months Ended
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Dec. 31, 2016
Notes Tables |
Schedule of Accrued Liabilities [Table Text Block] |
|  | 2016 |  |  | 2015 |
Operating properties: |  |  |  |  |  |  |  |
Greens Creek |  | $ | 39,014 |  |  | $ | 41,338 |
Lucky Friday |  |  | 9,194 |  |  |  | 5,212 |
Casa Berardi |  |  | 5,475 |  |  |  | 5,494 |
San Sebastian |  |  | 5,425 |  |  |  | 1,189 |
Non-operating properties: |  |  |  |  |  |  |  |
Troy mine |  |  | 16,167 |  |  |  | 17,295 |
South Dakota and Colorado Superfund Sites |  |  | — |  |  |  | 16,300 |
Johnny M |  |  | 5,830 |  |  |  | 5,830 |
Republic |  |  | 1,500 |  |  |  | 774 |
All other sites |  |  | 2,975 |  |  |  | 2,106 |
Total |  |  | 85,580 |  |  |  | 95,538 |
Reclamation and closure costs, current |  |  | (5,653 | ) |  |  | (20,989 | )
Reclamation and closure costs, long-term |  | $ | 79,927 |  |  | $ | 74,549 |
Accrued Reclamation and Closure Cost Liability Activity [Table Text Block] |
Balance at January 1, 2014 |  | $ | 105,191 |
Accruals for estimated costs |  |  | 6,863 |
Accretion expense |  |  | 3,089 |
Revision of estimated cash flows due to changes in reclamation plans |  |  | 675 |
Payment of reclamation obligations |  |  | (58,568 | )
Balance at December 31, 2014 |  |  | 57,250 |
Accruals for estimated costs |  |  | 15,114 |
Accretion expense |  |  | 1,904 |
Revision of estimated cash flows due to changes in reclamation plans |  |  | 4,112 |
Addition due to development and production at our San Sebastian unit |  |  | 1,189 |
Liability addition due to acquisition of Revett |  |  | 17,513 |
Payment of reclamation obligations |  |  | (1,544 | )
Balance at December 31, 2015 |  |  | 95,538 |
Accruals for estimated costs |  |  | 672 |
Accretion expense |  |  | 3,191 |
Revision of estimated cash flows due to changes in reclamation plans |  |  | 2,759 |
Liability addition due to acquisition of Mines Management |  |  | 1,124 |
Payment of reclamation obligations |  |  | (17,704 | )
Balance at December 31, 2016 |  | $ | 85,580 |
Schedule of Change in Asset Retirement Obligation [Table Text Block] |
|  | 2016 |  |  | 2015 |
Balance January 1 |  | $ | 53,233 |  |  | $ | 46,539 |
Changes in obligations due to changes in reclamation plans |  |  | 2,760 |  |  |  | 4,112 |
Addition due to development and production at our San Sebastian unit |  |  | — |  |  |  | 1,189 |
Accretion expense |  |  | 3,191 |  |  |  | 1,904 |
Payment of reclamation obligations |  |  | (76 | ) |  |  | (511 | )
Balance at December 31 |  | $ | 59,108 |  |  | $ | 53,233 |

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