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Note 11 - Derivative Instruments (Tables) | 3 Months Ended
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Mar. 31, 2019
Notes Tables |
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] |
March 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2019 settlements |  |  | 710 |  |  |  | 3 |  |  |  | 19,952 |  |  |  | 2,646 |  |  | $ | 15.46 |  |  | $ | 1,316 |  |  | $ | 1.22 |  |  | $ | 0.92 |
Contracts on forecasted sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2019 settlements |  |  | — |  |  |  | — |  |  |  | 26,180 |  |  |  | 1,653 |  |  |  | N/A |  |  |  | N/A |  |  | $ | 1.25 |  |  | $ | 0.96 |
2020 settlements |  |  | — |  |  |  | — |  |  |  | 276 |  |  |  | 551 |  |  |  | N/A |  |  |  | N/A |  |  | $ | 1.26 |  |  | $ | 0.96 |
December 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2019 settlements |  |  | 842 |  |  |  | 4 |  |  |  | 18,450 |  |  |  | 2,700 |  |  | $ | 14.69 |  |  | $ | 1,260 |  |  | $ | 1.15 |  |  | $ | 0.89 |

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- Definition Tabular disclosure of the notional amounts of outstanding derivative positions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 + Details
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