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Note 11 - Derivative Instruments (Tables) | 3 Months Ended
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Mar. 31, 2020
Notes Tables |
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] |
March 31, 2020 |  | 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2020 settlements |  |  | 45 |  |  |  | — |  |  |  | 21,330 |  |  |  | 7,441 |  |  | $ | 17.82 |  |  |  | N/A |  |  | $ | 0.91 |  |  | $ | 0.78 |
Contracts on forecasted sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2020 settlements |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 5,842 |  |  |  | N/A |  |  |  | N/A |  |  |  | N/A |  |  | $ | 0.98 |
December 31, 2019 |  | 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2020 settlements |  |  | 2,556 |  |  |  | 10 |  |  |  | 21,550 |  |  |  | 5,159 |  |  | $ | 17.20 |  |  | $ | 1,481 |  |  | $ | 1.04 |  |  | $ | 0.88 |
Contracts on forecasted sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2020 settlements |  |  | — |  |  |  | — |  |  |  | 441 |  |  |  | 11,740 |  |  |  | N/A |  |  |  | N/A |  |  | $ | 1.13 |  |  | $ | 0.98 |
March 31, 2020 |  | Ounces under contract (in 000's) |  |  | Average price per ounce |
|  | Silver |  |  | Gold |  |  | Silver |  |  | Gold |
|  | (ounces) |  |  | (ounces) |  |  | (ounces) |  |  | (ounces) |
Contracts on forecasted sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2020 settlements |  |  | 2,840 |  |  |  | 95 |  |  | $ | 16.00 |  |  | $ | 1,482 |
December 31, 2019 |  | Ounces under contract (in 000's) |  |  | Average price per ounce |
|  | Silver |  |  | Gold |  |  | Silver |  |  | Gold |
|  | (ounces) |  |  | (ounces) |  |  | (ounces) |  |  | (ounces) |
Contracts on forecasted sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2020 settlements |  |  | 5,700 |  |  |  | 130 |  |  | $ | 15.73 |  |  | $ | 1,435 |

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