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Note 10 - Derivative Instruments (Tables) | 12 Months Ended
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Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] |
December 31, 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2015 settlements |  |  | 1,607 |  |  |  | 6 |  |  |  | 19,456 |  |  |  | 8,378 |  |  | $ | 16.06 |  |  | $ | 1,195 |  |  | $ | 1.01 |  |  | $ | 0.87 |
Contracts on forecasted sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2015 settlements |  |  | — |  |  |  | — |  |  |  | 46,738 |  |  |  | 29,652 |  |  | N/A |  |  | N/A |  |  | $ | 0.96 |  |  | $ | 1.07 |
2016 settlements |  |  | — |  |  |  | — |  |  |  | 44,699 |  |  |  | 34,337 |  |  | N/A |  |  | N/A |  |  | $ | 0.99 |  |  | $ | 1.03 |
2017 settlements |  |  | — |  |  |  | — |  |  |  | 1,984 |  |  |  | — |  |  | N/A |  |  | N/A |  |  | $ | 1.04 |  |  | 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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