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Note 4 - Environmental and Reclamation Activities (Tables) | 12 Months Ended
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Dec. 31, 2014
Environmental And Reclamation Activities [Abstract] |
Schedule of Accrued Liabilities [Table Text Block] |
|  | 2014 |  |  | 2013 |
Operating properties: |  |  |  |  |  |  |  |
Greens Creek |  | $ | 39,237 |  |  | $ | 34,530 |
Lucky Friday |  |  | 1,069 |  |  |  | 919 |
Casa Berardi |  |  | 6,233 |  |  |  | 7,795 |
Non-operating properties: |  |  |  |  |  |  |  |
Coeur d’Alene Basin |  |  | — |  |  |  | 55,499 |
Johnny M |  |  | 5,830 |  |  |  | 303 |
Republic |  |  | 1,389 |  |  |  | 3,023 |
All other sites |  |  | 3,492 |  |  |  | 3,122 |
Total |  |  | 57,250 |  |  |  | 105,191 |
Reclamation and closure costs, current |  |  | (1,631 | ) |  |  | (58,425 | )
Reclamation and closure costs, long-term |  | $ | 55,619 |  |  | $ | 46,766 |
Accrued Reclamation and Closure Cost Liability Activity [Table Text Block] |
Balance at January 1, 2012 |  | $ | 153,811 |
Accruals for estimated costs |  |  | 4,325 |
Revision of estimated cash flows due to changes in reclamation plans |  |  | (3,738 | )
Payment of reclamation obligations |  |  | (41,183 | )
Balance at December 31, 2012 |  |  | 113,215 |
Accruals for estimated costs |  |  | 2,250 |
Liability addition due to acquisition of the Casa Berardi unit |  |  | 7,998 |
Payment of reclamation obligations |  |  | (18,272 | )
Balance at December 31, 2013 |  |  | 105,191 |
Accruals for estimated costs |  |  | 9,952 |
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 |
Schedule of Change in Asset Retirement Obligation [Table Text Block] |
|  | 2014 |  |  | 2013 |
Balance January 1 |  | $ | 43,244 |  |  | $ | 34,325 |
Changes in obligations due to changes in reclamation plans |  |  | 675 |  |  |  | — |
Addition due to acquisition of the Casa Berardi unit |  |  | — |  |  |  | 7,998 |
Accretion expense |  |  | 3,089 |  |  |  | 1,958 |
Payment of reclamation obligations |  |  | (469 | ) |  |  | (1,037 | )
Balance at December 31 |  | $ | 46,539 |  |  | $ | 43,244 |

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