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Note 11 - Derivative Instruments (Tables) | 6 Months Ended
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Jun. 30, 2017
Notes Tables |
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] |
June 30, 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2017 settlements |  |  | 1,379 |  |  |  | 7 |  |  |  | 15,873 |  |  |  | 6,724 |  |  | $ | 17.14 |  |  | $ | 1,259 |  |  | $ | 1.21 |  |  | $ | 0.97 |
Contracts on forecasted sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2017 settlements |  |  | — |  |  |  | — |  |  |  | 6,834 |  |  |  | 6,504 |  |  |  | N/A |  |  |  | N/A |  |  | $ | 1.26 |  |  | $ | 1.05 |
2018 settlements |  |  | — |  |  |  | — |  |  |  | 28,329 |  |  |  | 16,314 |  |  |  | N/A |  |  |  | N/A |  |  | $ | 1.23 |  |  | $ | 1.05 |
2019 settlements |  |  | — |  |  |  | — |  |  |  | 1,102 |  |  |  | 1,102 |  |  |  | N/A |  |  |  | N/A |  |  | $ | 1.21 |  |  | $ | 1.06 |
December 31, 2016 |  | 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2017 settlements |  |  | 1,295 |  |  |  | 4 |  |  |  | 19,070 |  |  |  | 7,441 |  |  | $ | 16.29 |  |  | $ | 1,172 |  |  | $ | 1.18 |  |  | $ | 0.97 |
Contracts on forecasted sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2017 settlements |  |  | — |  |  |  | — |  |  |  | 35,384 |  |  |  | 17,637 |  |  |  | N/A |  |  |  | N/A |  |  | $ | 1.19 |  |  | $ | 1.03 |
2018 settlements |  |  | — |  |  |  | — |  |  |  | 13,779 |  |  |  | 5,732 |  |  |  | N/A |  |  |  | N/A |  |  | $ | 1.21 |  |  | $ | 1.05 |

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