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Note 10. Derivative Instruments (Tables) | 12 Months Ended
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Dec. 31, 2011
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] |
December 31, 2011 |  | Metric tonnes under contract |  |  | Average price per pound |
|  | Zinc |  |  | Lead |  |  | Zinc |  |  | Lead |
Contracts on provisional sales |  |  |  |  |  |  |  |  |  |  |  |
2012 settlements |  |  | 9,600 |  |  |  | 2,600 |  |  | $ | 0.86 |  |  | $ | 0.89 |
Contracts on forecasted sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2012 settlements |  |  | 20,500 |  |  |  | 15,900 |  |  | $ | 1.12 |  |  | $ | 1.12 |
2013 settlements |  |  | 8,275 |  |  |  | 11,150 |  |  | $ | 1.14 |  |  | $ | 1.17 |
December 31, 2010 |  | Metric tonnes under contract |  |  | Average price per pound |
|  | Zinc |  |  | Lead |  |  | Zinc |  |  | Lead |
Contracts on provisional sales |  |  |  |  |  |  |  |  |  |  |  |
2011 settlements |  |  | 11,575 |  |  |  | 3,925 |  |  | $ | 1.05 |  |  | $ | 1.11 |
Contracts on forecasted sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2011 settlements |  |  | 19,475 |  |  |  | 15,550 |  |  | $ | 0.96 |  |  | $ | 0.96 |
2012 settlements |  |  | 21,475 |  |  |  | 15,000 |  |  | $ | 1.11 |  |  | $ | 1.11 |
Schedule of Interest Rate Derivatives [Table Text Block] |
Loss reclassified from accumulated other comprehensive loss to interest expense | $ | 1,967 |
Loss recognized in interest expense related to the ineffective portion | 213 |

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- Definition Tabular disclosure of interest rate derivatives, including, but not limited to, the fair value of the derivatives, statement of financial position location, and statement of financial performance location of these instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 815 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph -Name Accounting Standards Codification -Paragraph 4C -Section 50 -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624171-113959 + Details
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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 -Topic 815 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph (d) -Name Accounting Standards Codification -Paragraph 1A -Section 50 -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5579245-113959 + Details
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