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Note 10 - Derivative Instruments - Summary of Forward Sales Contracts (Details) oz in Thousands, lb in Thousands | 12 Months Ended
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Dec. 31, 2016 oz $ / oz | Dec. 31, 2015 lb oz $ / oz $ / lb
Silver 2017 Settlements for Provisional Sales [Member] |  |
Ounces/pounds under contract (Ounce) | oz | 1,295 |
Average price per ounce/pound (in USD per Ounce) | $ / oz | 16.29 |
Silver 2016 Settlements for Provisional Sales [Member] |  |
Ounces/pounds under contract (Ounce) | oz |  | 1,368
Average price per ounce/pound (in USD per Ounce) | $ / oz |  | 14.12
Gold 2017 Settlements for Provisional Sales [Member] |  |
Ounces/pounds under contract (Ounce) | oz | 4 |
Average price per ounce/pound (in USD per Ounce) | $ / oz | 1,172 |
Gold 2016 Settlements for Provisional Sales [Member] |  |
Ounces/pounds under contract (Ounce) | oz |  | 5
Average price per ounce/pound (in USD per Ounce) | $ / oz |  | 1,076
Zinc 2017 Settlements for Provisional Sales [Member] |  |
Ounces/pounds under contract (Ounce) | oz | 19,070 |
Average price per ounce/pound (in USD per Ounce) | $ / oz | 1.18 |
Zinc 2016 Settlements for Provisional Sales [Member] |  |
Ounces/pounds under contract (Ounce) | lb |  | 23,755
Average price per ounce/pound (in USD per Ounce) | $ / lb |  | 0.71
Lead 2017 Settlements for Provisional Sales [Member] |  |
Ounces/pounds under contract (Ounce) | oz | 7,441 |
Average price per ounce/pound (in USD per Ounce) | $ / oz | 0.97 |
Lead 2016 Settlements for Provisional Sales [Member] |  |
Ounces/pounds under contract (Ounce) | lb |  | 8,433
Average price per ounce/pound (in USD per Ounce) | $ / lb |  | 0.77
Silver 2017 Settlements for Forecasted Sales [Member] |  |
Ounces/pounds under contract (Ounce) | oz |  |
Average price per ounce/pound (in USD per Ounce) | $ / oz |  |
Gold 2017 Settlements for Forecasted Sales [Member] |  |
Ounces/pounds under contract (Ounce) | oz |  |
Average price per ounce/pound (in USD per Ounce) | $ / oz |  |
Zinc 2017 Settlements for Forecasted Sales [Member] |  |
Ounces/pounds under contract (Ounce) | oz | 35,384 |
Average price per ounce/pound (in USD per Ounce) | $ / oz | 1.19 |
Lead 2017 Settlements for Forecasted Sales [Member] |  |
Ounces/pounds under contract (Ounce) | oz | 17,637 |
Average price per ounce/pound (in USD per Ounce) | $ / oz | 1.03 |
Silver 2018 Settlements for Forecasted Sales [Member] |  |
Ounces/pounds under contract (Ounce) | oz |  |
Average price per ounce/pound (in USD per Ounce) | $ / oz |  |
Gold 2018 Settlements for Forecasted Sales [Member] |  |
Ounces/pounds under contract (Ounce) | oz |  |
Average price per ounce/pound (in USD per Ounce) | $ / oz |  |
Zinc 2018 Settlements for Forecasted Sales [Member] |  |
Ounces/pounds under contract (Ounce) | oz | 13,779 |
Average price per ounce/pound (in USD per Ounce) | $ / oz | 1.21 |
Lead 2018 Settlements for Forecasted Sales [Member] |  |
Ounces/pounds under contract (Ounce) | oz | 5,732 |
Average price per ounce/pound (in USD per Ounce) | $ / oz | 1.05 |

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