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Note 11 - Derivative Instruments (Tables) | 6 Months Ended
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Jun. 30, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] |
June 30, 2014 |  | 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2014 settlements |  |  | 786 |  |  |  | 4 |  |  |  | 12,236 |  |  |  | 6,449 |  |  | $ | 18.90 |  |  | $ | 1,263 |  |  | $ | 0.95 |  |  | $ | 0.95 |
Contracts on forecasted sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2014 settlements |  |  | — |  |  |  | — |  |  |  | 19,566 |  |  |  | 14,330 |  |  | N/A |  |  | N/A |  |  | $ | 1.01 |  |  | $ | 1.09 |
2015 settlements |  |  | — |  |  |  | — |  |  |  | 49,604 |  |  |  | 40,179 |  |  | N/A |  |  | N/A |  |  | $ | 0.96 |  |  | $ | 1.07 |
2016 settlements |  |  | — |  |  |  | — |  |  |  | 32,022 |  |  |  | 32,132 |  |  | N/A |  |  | N/A |  |  | $ | 0.97 |  |  | $ | 1.03 |
2017 settlements |  |  | — |  |  |  | — |  |  |  | 661 |  |  |  | — |  |  | N/A |  |  | N/A |  |  | $ | 0.99 |  |  | N/A |
December 31, 2013 |  | 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2014 settlements |  |  | 673 |  |  |  | 3 |  |  |  | 11,188 |  |  |  | 3,472 |  |  | $ | 19.50 |  |  | $ | 1,205 |  |  | $ | 0.89 |  |  | $ | 1.00 |
Contracts on forecasted sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2014 settlements |  |  | — |  |  |  | — |  |  |  | 31,967 |  |  |  | 34,282 |  |  | N/A |  |  | N/A |  |  | $ | 1.00 |  |  | $ | 1.04 |
2015 settlements |  |  | — |  |  |  | — |  |  |  | 39,683 |  |  |  | 36,982 |  |  | N/A |  |  | N/A |  |  | $ | 0.96 |  |  | $ | 1.07 |
2016 settlements |  |  | — |  |  |  | — |  |  |  | 3,803 |  |  |  | 30,589 |  |  | N/A |  |  | N/A |  |  | $ | 0.93 |  |  | $ | 1.03 |

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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=35706170&loc=SL5579245-113959 + Details
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