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Note 11 - Derivative Instruments (Tables) | 3 Months Ended
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Mar. 31, 2018
Notes Tables |
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] |
March 31, 2018 |  | Ounces/pounds under contract (in 000's) |  |  | Average price per ounce/pound |
|  | Silver |  |  | Gold |  |  | Zinc |  |  | Lead |  |  | Silver |  |  | Gold |  |  | Zinc |  |  | Lead |
|  | (ounces) |  |  | (ounces) |  |  | (pounds) |  |  | (pounds) |  |  | (ounces) |  |  | (ounces) |  |  | (pounds) |  |  | (pounds) |
Contracts on provisional sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2018 settlements |  |  | 543 |  |  |  | 2 |  |  |  | 7,385 |  |  |  | — |  |  | $ | 16.91 |  |  | $ | 1,342 |  |  | $ | 1.52 |  |  |  | N/A |
Contracts on forecasted sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2018 settlements |  |  | — |  |  |  | — |  |  |  | 26,841 |  |  |  | 15,598 |  |  |  | N/A |  |  |  | N/A |  |  | $ | 1.23 |  |  | $ | 1.07 |
2019 settlements |  |  | — |  |  |  | — |  |  |  | 48,502 |  |  |  | 20,283 |  |  |  | N/A |  |  |  | N/A |  |  | $ | 1.40 |  |  | $ | 1.10 |
2020 settlements |  |  | — |  |  |  | — |  |  |  | 42,329 |  |  |  | 19,401 |  |  |  | N/A |  |  |  | N/A |  |  | $ | 1.40 |  |  | $ | 1.13 |
December 31, 2017 |  | Ounces/pounds under contract (in 000's) |  |  | Average price per ounce/pound |
|  | Silver |  |  | Gold |  |  | Zinc |  |  | Lead |  |  | Silver |  |  | Gold |  |  | Zinc |  |  | Lead |
|  | (ounces) |  |  | (ounces) |  |  | (pounds) |  |  | (pounds) |  |  | (ounces) |  |  | (ounces) |  |  | (pounds) |  |  | (pounds) |
Contracts on provisional sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2018 settlements |  |  | 1,447 |  |  |  | 5 |  |  |  | 21,550 |  |  |  | 4,740 |  |  | $ | 16.64 |  |  | $ | 1,279 |  |  | $ | 1.45 |  |  | $ | 1.11 |
Contracts on forecasted sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2018 settlements |  |  | — |  |  |  | — |  |  |  | 32,187 |  |  |  | 16,645 |  |  |  | N/A |  |  |  | N/A |  |  | $ | 1.29 |  |  | $ | 1.06 |
2019 settlements |  |  | — |  |  |  | — |  |  |  | 23,589 |  |  |  | 18,078 |  |  |  | N/A |  |  |  | N/A |  |  | $ | 1.33 |  |  | $ | 1.09 |
2020 settlements |  |  | — |  |  |  | — |  |  |  | 3,307 |  |  |  | 2,866 |  |  |  | N/A |  |  |  | N/A |  |  | $ | 1.27 |  |  | $ | 1.08 |

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