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Note 11 - Derivative Instruments (Tables) | 9 Months Ended
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Sep. 30, 2016
Notes Tables |
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] |
September 30, 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2016 settlements |  |  | 1,124 |  |  |  | 2 |  |  |  | 25,739 |  |  |  | 13,117 |  |  | $ | 19.65 |  |  | $ | 1,338 |  |  | $ | 1.03 |  |  | $ | 0.92 |
2017 settlements |  |  | — |  |  |  | — |  |  |  | 3,858 |  |  |  | — |  |  | $ | — |  |  | $ | — |  |  | $ | 1.08 |  |  | $ | — |
December 31, 2015 |  | 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2016 settlements |  |  | 1,368 |  |  |  | 5 |  |  |  | 23,755 |  |  |  | 8,433 |  |  | $ | 14.12 |  |  | $ | 1,076 |  |  | $ | 0.71 |  |  | $ | 0.77 |

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- Definition Tabular disclosure of the notional amounts of outstanding derivative positions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5579245-113959 + Details
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