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Note 11 - Derivative Instruments (Tables) | 3 Months Ended
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Mar. 31, 2013
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] |
March 31, 2013 |  | Pounds under contract (in thousands) |  |  | Average price per pound |
|  | Zinc |  |  | Lead |  |  | Zinc |  |  | Lead |
Contracts on provisional sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2013 settlements |  |  | 14,716 |  |  |  | 7,165 |  |  | $ | 0.93 |  |  | $ | 1.08 |
Contracts on forecasted sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2013 settlements |  |  | 30,258 |  |  |  | 26,951 |  |  | $ | 0.98 |  |  | $ | 1.09 |
2014 settlements |  |  | 60,516 |  |  |  | 47,619 |  |  | $ | 0.99 |  |  | $ | 1.05 |
2015 settlements |  |  | 20,944 |  |  |  | 37,864 |  |  | $ | 1.00 |  |  | $ | 1.07 |
December 31, 2012 |  | Pounds under contract (in thousands) |  |  | Average price per pound |
|  | Zinc |  |  | Lead |  |  | Zinc |  |  | Lead |
Contracts on provisional sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2013 settlements |  |  | 14,991 |  |  |  | 6,945 |  |  | $ | 0.95 |  |  | $ | 1.00 |
Contracts on forecasted sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2013 settlements |  |  | 35,935 |  |  |  | 32,794 |  |  | $ | 0.96 |  |  | $ | 1.11 |
2014 settlements |  |  | 30,203 |  |  |  | 33,069 |  |  | $ | 0.98 |  |  | $ | 1.03 |
2015 settlements |  |  | 3,307 |  |  |  | 23,534 |  |  | $ | 1.01 |  |  | $ | 1.06 |

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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=7476318&loc=SL5579245-113959 + Details
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Namespace Prefix: | us-gaap_
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