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Note 11 - Derivative Instruments (Details) - Summary Of Forward Sales Contracts (USD $) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2013 lb | Dec. 31, 2012 lb
2013 Settlements [Member] | Silver [Member] |  |
Note 11 - Derivative Instruments (Details) - Summary Of Forward Sales Contracts [Line Items] |  |
Ounces Under Contract (in Pounds and Ounces) | 1,384 |
Average Price Per Ounce | $ 22.40 |
Average Price Per Pound | 22.40 |
2013 Settlements [Member] | Gold [Member] |  |
Note 11 - Derivative Instruments (Details) - Summary Of Forward Sales Contracts [Line Items] |  |
Ounces Under Contract (in Pounds and Ounces) | 5 |
Average Price Per Ounce | 1,354 |
Average Price Per Pound | 1,354 |
2013 Settlements [Member] | Zinc [Member] |  |
Note 11 - Derivative Instruments (Details) - Summary Of Forward Sales Contracts [Line Items] |  |
Pounds Under Contract (in Pounds) | 16,975 | 14,991
Average Price Per Ounce | 0.87 | 0.95
Average Price Per Pound | 0.87 | 0.95
Pounds Under Contract (in Pounds) | 3,527 | 35,935
Average Price Per Pound | 0.95 | 0.96
2013 Settlements [Member] | Lead [Member] |  |
Note 11 - Derivative Instruments (Details) - Summary Of Forward Sales Contracts [Line Items] |  |
Pounds Under Contract (in Pounds) | 8,047 | 6,945
Average Price Per Ounce | 0.97 | 1.00
Average Price Per Pound | 0.97 | 1.00
Pounds Under Contract (in Pounds) | 4,079 | 32,794
Average Price Per Pound | 1.07 | 1.11
2014 Settlements [Member] | Zinc [Member] |  |
Note 11 - Derivative Instruments (Details) - Summary Of Forward Sales Contracts [Line Items] |  |
Pounds Under Contract (in Pounds) | 60,516 | 30,203
Average Price Per Pound | 0.99 | 0.98
2014 Settlements [Member] | Lead [Member] |  |
Note 11 - Derivative Instruments (Details) - Summary Of Forward Sales Contracts [Line Items] |  |
Pounds Under Contract (in Pounds) | 47,619 | 33,069
Average Price Per Pound | 1.05 | 1.03
2015 Settlements [Member] | Zinc [Member] |  |
Note 11 - Derivative Instruments (Details) - Summary Of Forward Sales Contracts [Line Items] |  |
Pounds Under Contract (in Pounds) | 42,769 | 3,307
Average Price Per Pound | 0.96 | 1.01
2015 Settlements [Member] | Lead [Member] |  |
Note 11 - Derivative Instruments (Details) - Summary Of Forward Sales Contracts [Line Items] |  |
Pounds Under Contract (in Pounds) | 39,628 | 23,534
Average Price Per Pound | 1.07 | 1.06
2016 Settlements [Member] | Zinc [Member] |  |
Note 11 - Derivative Instruments (Details) - Summary Of Forward Sales Contracts [Line Items] |  |
Pounds Under Contract (in Pounds) | 661 |
Average Price Per Pound | 0.97 |
2016 Settlements [Member] | Lead [Member] |  |
Note 11 - Derivative Instruments (Details) - Summary Of Forward Sales Contracts [Line Items] |  |
Pounds Under Contract (in Pounds) | 9,755 |
Average Price Per Pound | $ 1.04 |

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