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Note 10 - Derivative Instruments (Details Textual) $ in Thousands, MXN in Millions, CAD in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2016 CAD | Dec. 31, 2016 MXN
Maximum Allocation of Forecasted CAD-demonimated Operating Costs | 75.00% |  |  | 75.00% | 75.00%
Forecasted CAD-denominated Operating Costs to be Hedged, Term | 5 years |  |  |  |
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax | $ (5,200) |  |  |  |
Gain (Loss) on Components Excluded from Assessment of Foreign Currency Cash Flow Hedge Effectiveness | (2) |  |  |  |
Derivative, Gain on Derivative | 14,200 | $ 6,200 | $ 1,500 |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 6,400 |  |  |  |
Derivative, Fair Value, Obligations Under the Agreements | 6,400 |  |  |  |
Other Comprehensive Income (Loss) [Member] |  |  |  |  |
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months | (3,000) |  |  |  |
Other Noncurrent Assets [Member] |  |  |  |  |
Derivative Asset, Noncurrent | 2,500 |  |  |  |
Other Current Liabilities [Member] |  |  |  |  |
Derivative Liability, Current | 700 |  |  |  |
Other Current Assets [Member] |  |  |  |  |
Derivative Asset, Current | $ 2,800 |  |  |  |
Casa Berardi [Member] | Minimum [Member] |  |  |  |  |
Derivative, Forward Contracts, Forecasted Cash Operating Costs, Percent | 21.00% |  |  | 21.00% | 21.00%
Casa Berardi [Member] | Maximum [Member] |  |  |  |  |
Derivative, Forward Contracts, Forecasted Cash Operating Costs, Percent | 75.00% |  |  | 75.00% | 75.00%
San Sebastian [Member] |  |  |  |  |
Derivative, Forward Contracts, Forecasted Cash Operating Costs, Percent | 75.00% |  |  | 75.00% | 75.00%
Foreign Exchange Contract [Member] | Other Noncurrent Assets [Member] |  |  |  |  |
Derivative Asset, Noncurrent | $ 27 |  |  |  |
Foreign Exchange Contract [Member] | Other Current Liabilities [Member] |  |  |  |  |
Derivative Liability, Current | 2,800 |  |  |  |
Foreign Exchange Contract [Member] | Other Noncurrent Liabilities [Member] |  |  |  |  |
Derivative Liability, Noncurrent | $ 2,400 |  |  |  |
Foreign Exchange Contract [Member] | Casa Berardi [Member] | Minimum [Member] | United States of America, Dollars |  |  |  |  |
Derivative, Forward Exchange Rate | 1.2787 |  |  | 1.2787 | 1.2787
Foreign Exchange Contract [Member] | Casa Berardi [Member] | Maximum [Member] | United States of America, Dollars |  |  |  |  |
Derivative, Forward Exchange Rate | 1.338 |  |  | 1.338 | 1.338
Foreign Exchange Contract [Member] | San Sebastian [Member] | Minimum [Member] | United States of America, Dollars |  |  |  |  |
Derivative, Forward Exchange Rate | 18.9975 |  |  | 18.9975 | 18.9975
Foreign Exchange Contract [Member] | San Sebastian [Member] | Maximum [Member] | United States of America, Dollars |  |  |  |  |
Derivative, Forward Exchange Rate | 21 |  |  | 21 | 21
Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member] | Casa Berardi [Member] |  |  |  |  |
Derivative, Number of Instruments Held | 130 |  |  | 130 | 130
Derivative, Notional Amount | $ 222,900 |  |  | CAD 290.1 |
Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member] | San Sebastian [Member] |  |  |  |  |
Derivative, Number of Instruments Held | 24 |  |  | 24 | 24
Derivative, Notional Amount | $ 10,300 |  |  |  | MXN 202.5
Unsettled Concentrate Sales Contracts [Member] |  |  |  |  |
Derivative, Loss on Derivative | 14,200 |  |  |  |
Forecasted Future Concentrate Contracts [Member] |  |  |  |  |
Derivative, Gain on Derivative | $ 4,400 |  |  |  |

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