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Note 10 - Derivative Instruments (Detail) - Summary Of Forward Sales Contracts (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 oz | Dec. 31, 2011 oz
Zinc [Member] | 2013 Settlements [Member] |  |
Contracts on provisional sales |  |
Metric Tonnes Under Contract | 14,991 |
Average Price Per Pound (in Dollars) | $ 0.95 |
Contracts on forecasted sales |  |
Metric Tonnes Under Contract | 35,935 | 18,243
Average Price Per Pound (in Dollars) | 0.96 | 1.14
Zinc [Member] | 2014 Settlements [Member] |  |
Contracts on forecasted sales |  |
Metric Tonnes Under Contract | 30,203 |
Average Price Per Pound (in Dollars) | 0.98 |
Zinc [Member] | 2015 Settlements [Member] |  |
Contracts on forecasted sales |  |
Metric Tonnes Under Contract | 3,307 |
Average Price Per Pound (in Dollars) | 1.01 |
Zinc [Member] | 2012 Settlements [Member] |  |
Contracts on provisional sales |  |
Metric Tonnes Under Contract |  | 21,164
Average Price Per Pound (in Dollars) |  | 0.86
Contracts on forecasted sales |  |
Metric Tonnes Under Contract |  | 45,195
Average Price Per Pound (in Dollars) |  | 1.12
Lead [Member] | 2013 Settlements [Member] |  |
Contracts on provisional sales |  |
Metric Tonnes Under Contract | 6,945 |
Average Price Per Pound (in Dollars) | 1.00 |
Contracts on forecasted sales |  |
Metric Tonnes Under Contract | 32,794 | 24,582
Average Price Per Pound (in Dollars) | 1.11 | 1.17
Lead [Member] | 2014 Settlements [Member] |  |
Contracts on forecasted sales |  |
Metric Tonnes Under Contract | 33,069 |
Average Price Per Pound (in Dollars) | 1.03 |
Lead [Member] | 2015 Settlements [Member] |  |
Contracts on forecasted sales |  |
Metric Tonnes Under Contract | 23,534 |
Average Price Per Pound (in Dollars) | 1.06 |
Lead [Member] | 2012 Settlements [Member] |  |
Contracts on provisional sales |  |
Metric Tonnes Under Contract |  | 5,732
Average Price Per Pound (in Dollars) |  | 0.89
Contracts on forecasted sales |  |
Metric Tonnes Under Contract |  | 35,053
Average Price Per Pound (in Dollars) |  | $ 1.12

X
- Definition Average settlement price in forward contracts on forecasted sales + References No definition available. + Details
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- Details
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- Definition Average settlement price in forward contracts on provisional sales + References No definition available. + Details
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- Details
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- Definition Metric tonnes included in open forward contracts on forecasted sales + References No definition available. + Details
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Data Type: | num:weightItemType
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- Definition Metric tonnes included in open forward contracts on provisional sales + References No definition available. + Details
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