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Note 5 - Environmental and Reclamation Activities (Tables) | 12 Months Ended
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Dec. 31, 2021
Notes Tables |
Schedule of Accrued Liabilities [Table Text Block] |
|  | 2021 |  |  | 2020 |
Operating properties: |  |  |  |  |  |  |  |
Greens Creek |  | $ | 37,474 |  |  | $ | 42,716 |
Lucky Friday |  |  | 13,543 |  |  |  | 12,818 |
Casa Berardi |  |  | 12,497 |  |  |  | 11,730 |
Nevada Operations |  |  | 27,068 |  |  |  | 26,062 |
Non-operating properties: |  |  |  |  |  |  |  |
San Sebastian |  |  | 4,451 |  |  |  | 6,882 |
Troy mine |  |  | 4,813 |  |  |  | 5,340 |
Johnny M |  |  | 8,947 |  |  |  | 6,065 |
Republic |  |  | 1,500 |  |  |  | 1,500 |
All other sites |  |  | 2,938 |  |  |  | 2,935 |
Total |  |  | 113,231 |  |  |  | 116,048 |
Reclamation and closure costs, current |  |  | (9,259 | ) |  |  | (5,582 | )
Reclamation and closure costs, long-term |  | $ | 103,972 |  |  | $ | 110,466 |
Accrued Reclamation and Closure Cost Liability Activity [Table Text Block] |
Balance at January 1, 2019 |  | $ | 108,389 |
Accruals for estimated costs |  |  | 472 |
Accretion expense |  |  | 7,122 |
Revision of estimated cash flows due to changes in reclamation plans |  |  | (4,522 | )
Payment of reclamation obligations |  |  | (3,087 | )
Balance at December 31, 2019 |  |  | 108,374 |
Accretion expense |  |  | 5,912 |
Revision of estimated cash flows due to changes in reclamation plans |  |  | 2,543 |
Payment of reclamation obligations |  |  | (781 | )
Balance at December 31, 2020 |  |  | 116,048 |
Accruals for estimated costs |  |  | 4,952 |
Accretion expense |  |  | 6,454 |
Revision of estimated cash flows due to changes in reclamation plans |  |  | (8,781 | )
Payment of reclamation obligations |  |  | (5,442 | )
Balance at December 31, 2021 |  | $ | 113,231 |
Schedule of Change in Asset Retirement Obligation [Table Text Block] |
|  | 2021 |  |  | 2020 |
Balance January 1 |  | $ | 100,208 |  |  | $ | 91,831 |
Changes in obligations due to changes in reclamation plans |  |  | (8,781 | ) |  |  | 2,543 |
Accretion expense |  |  | 6,451 |  |  |  | 5,912 |
Payment of reclamation obligations |  |  | (2,845 | ) |  |  | (78 | )
Balance at December 31 |  | $ | 95,033 |  |  | $ | 100,208 |

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