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Note 10 - Derivative Instruments (Details) - Summary Of Forward Sales Contracts (USD $) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2013 lb | Dec. 31, 2012 lb
2014 Settlements [Member] | Silver [Member] |  |
Contracts on provisional sales |  |
Ounces Under Contract | 673,000 |
Average Price Per Ounce (in Dollars) | $ 19.50 |
Average Price Per Pound (in Dollars) | 19.50 |
2014 Settlements [Member] | Gold [Member] |  |
Contracts on provisional sales |  |
Ounces Under Contract | 3,000 |
Average Price Per Ounce (in Dollars) | 1,205 |
Average Price Per Pound (in Dollars) | 1,205 |
2014 Settlements [Member] | Zinc [Member] |  |
Contracts on provisional sales |  |
Pounds Under Contract | 11,188,000 |
Average Price Per Ounce (in Dollars) | 0.89 |
Average Price Per Pound (in Dollars) | 0.89 |
Contracts on forecasted sales |  |
Pounds Under Contract | 31,967,000 | 30,203,000
Average Price Per Pound (in Dollars) | 1.00 | 0.98
2014 Settlements [Member] | Lead [Member] |  |
Contracts on provisional sales |  |
Pounds Under Contract | 3,472,000 |
Average Price Per Ounce (in Dollars) | 1.00 |
Average Price Per Pound (in Dollars) | 1.00 |
Contracts on forecasted sales |  |
Pounds Under Contract | 34,282,000 | 33,069,000
Average Price Per Pound (in Dollars) | 1.04 | 1.03
2015 Settlements [Member] | Zinc [Member] |  |
Contracts on forecasted sales |  |
Pounds Under Contract | 39,683,000 | 3,307,000
Average Price Per Pound (in Dollars) | 0.96 | 1.01
2015 Settlements [Member] | Lead [Member] |  |
Contracts on forecasted sales |  |
Pounds Under Contract | 36,982,000 | 23,534,000
Average Price Per Pound (in Dollars) | 1.07 | 1.06
2016 Settlements [Member] | Zinc [Member] |  |
Contracts on forecasted sales |  |
Pounds Under Contract | 3,803,000 |
Average Price Per Pound (in Dollars) | 0.93 |
2016 Settlements [Member] | Lead [Member] |  |
Contracts on forecasted sales |  |
Pounds Under Contract | 30,589,000 |
Average Price Per Pound (in Dollars) | 1.03 |
2013 Settlements [Member] | Zinc [Member] |  |
Contracts on provisional sales |  |
Pounds Under Contract |  | 14,991,000
Average Price Per Ounce (in Dollars) |  | 0.95
Average Price Per Pound (in Dollars) |  | 0.95
Contracts on forecasted sales |  |
Pounds Under Contract |  | 35,935,000
Average Price Per Pound (in Dollars) |  | 0.96
2013 Settlements [Member] | Lead [Member] |  |
Contracts on provisional sales |  |
Pounds Under Contract |  | 6,945,000
Average Price Per Ounce (in Dollars) |  | 1.00
Average Price Per Pound (in Dollars) |  | 1.00
Contracts on forecasted sales |  |
Pounds Under Contract |  | 32,794,000
Average Price Per Pound (in Dollars) |  | $ 1.11

X
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