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Note 11 - Derivative Instruments (Tables) | 9 Months Ended
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Sep. 30, 2020
Notes Tables |
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] |
September 30, 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 |  |  | 910 |  |  |  | 2 |  |  |  | 23,975 |  |  |  | 5,512 |  |  | $ | 23.53 |  |  | $ | 1,948 |  |  | $ | 1.02 |  |  | $ | 0.84 |
2021 settlements |  |  | — |  |  |  | — |  |  |  | 6,945 |  |  |  | — |  |  |  | N/A |  |  |  | N/A |  |  | $ | 1.12 |  |  |  | N/A |
Contracts on forecasted sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2020 settlements |  |  | — |  |  |  | — |  |  |  | 827 |  |  |  | 8,543 |  |  |  | N/A |  |  |  | N/A |  |  | $ | 0.94 |  |  | $ | 0.81 |
2021 settlements |  |  | — |  |  |  | — |  |  |  | 27,448 |  |  |  | 12,136 |  |  |  | N/A |  |  |  | N/A |  |  | $ | 1.06 |  |  | $ | 0.86 |
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 |

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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=121590274&loc=SL5579245-113959 + Details
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