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Note 11 - Summary of Forward Sales Contracts (Details) - 2016 Settlements [Member] oz in Thousands, lb in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2016 lb oz $ / lb $ / oz | Dec. 31, 2015 lb oz $ / lb $ / oz
Silver [Member] |  |
Pounds Under Contract | oz | 1,523 | 1,368
Average Price | $ / oz | 17.4 | 14.12
Gold [Member] |  |
Pounds Under Contract | oz | 4 | 5
Average Price | $ / oz | 1,271 | 1,076
Zinc [Member] |  |
Pounds Under Contract | lb | 19,731 | 23,755
Average Price | $ / lb | 0.88 | 0.71
Lead [Member] |  |
Pounds Under Contract | lb | 8,818 | 8,433
Average Price | $ / lb | 0.79 | 0.77

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