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Note 11 - Derivative Instruments (Details) - Summary of Forward Sales Contracts lb in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 $ / oz $ / lb oz lb | Dec. 31, 2014 $ / oz $ / lb oz lb
Silver [Member] | 2015 Settlements [Member] |  |
Contracts on provisional sales |  |
Pounds Under Contract (in Ounces) | oz | 1,271 | 1,607
Average Price Per Pound | 14.74 | 16.06
Average Price Per Ounce | 14.74 | 16.06
Contracts on forecasted sales |  |
Average Price Per Pound |  |
Average Price Per Ounce |  |
Silver [Member] | 2016 Settlements [Member] |  |
Contracts on forecasted sales |  |
Average Price Per Pound |  |
Average Price Per Ounce |  |
Silver [Member] | 2017 Settlements [Member] |  |
Contracts on forecasted sales |  |
Average Price Per Pound |  |
Average Price Per Ounce |  |
Gold [Member] | 2015 Settlements [Member] |  |
Contracts on provisional sales |  |
Pounds Under Contract (in Ounces) | oz | 5 | 6
Average Price Per Pound | 1,135 | 1,195
Average Price Per Ounce | 1,135 | 1,195
Contracts on forecasted sales |  |
Average Price Per Pound |  |
Average Price Per Ounce |  |
Gold [Member] | 2016 Settlements [Member] |  |
Contracts on forecasted sales |  |
Average Price Per Pound |  |
Average Price Per Ounce |  |
Gold [Member] | 2017 Settlements [Member] |  |
Contracts on forecasted sales |  |
Average Price Per Pound |  |
Average Price Per Ounce |  |
Zinc [Member] | 2015 Settlements [Member] |  |
Contracts on provisional sales |  |
Pounds Under Contract (in Pounds) | lb | 18,684 | 19,456
Average Price Per Pound | $ / lb | 0.85 | 1.01
Average Price Per Ounce | $ / lb | 0.85 | 1.01
Contracts on forecasted sales |  |
Pounds Under Contract (in Pounds) | lb |  | 46,738
Average Price Per Pound | $ / lb |  | 0.96
Average Price Per Ounce | $ / lb |  | 0.96
Zinc [Member] | 2016 Settlements [Member] |  |
Contracts on forecasted sales |  |
Pounds Under Contract (in Pounds) | lb |  | 44,699
Average Price Per Pound | $ / lb |  | 0.99
Average Price Per Ounce | $ / lb |  | 0.99
Zinc [Member] | 2017 Settlements [Member] |  |
Contracts on forecasted sales |  |
Pounds Under Contract (in Pounds) | lb |  | 1,984
Average Price Per Pound | $ / lb |  | 1.04
Average Price Per Ounce | $ / lb |  | 1.04
Lead [Member] | 2015 Settlements [Member] |  |
Contracts on provisional sales |  |
Pounds Under Contract (in Pounds) | lb | 6,283 | 8,378
Average Price Per Pound | $ / lb | 0.76 | 0.87
Average Price Per Ounce | $ / lb | 0.76 | 0.87
Contracts on forecasted sales |  |
Pounds Under Contract (in Pounds) | lb |  | 29,652
Average Price Per Pound | $ / lb |  | 1.07
Average Price Per Ounce | $ / lb |  | 1.07
Lead [Member] | 2016 Settlements [Member] |  |
Contracts on forecasted sales |  |
Pounds Under Contract (in Pounds) | lb |  | 34,337
Average Price Per Pound | $ / lb |  | 1.03
Average Price Per Ounce | $ / lb |  | 1.03
Lead [Member] | 2017 Settlements [Member] |  |
Contracts on forecasted sales |  |
Average Price Per Pound | $ / lb |  |
Average Price Per Ounce | $ / lb |  |

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