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Note 11 - Summary of Forward Sales Contracts (Details) - 2015 Settlements [Member] oz in Thousands, lb in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 lb oz $ / lb $ / oz | Dec. 31, 2015 lb oz $ / lb $ / oz
Silver [Member] |  |
Pounds Under Contract | oz | 1,196 | 1,368
Average Price | $ / oz | 15.29 | 14.12
Gold [Member] |  |
Pounds Under Contract | oz | 4 | 5
Average Price | $ / oz | 1,225 | 1,076
Zinc [Member] |  |
Pounds Under Contract | lb | 15,818 | 23,755
Average Price | $ / lb | 0.8 | 0.71
Lead [Member] |  |
Pounds Under Contract | lb | 9,700 | 8,433
Average Price | $ / lb | 0.77 | 0.77

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- Definition Pounds under contract provisional sales. + References No definition available. + Details
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