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Note 11 - Derivative Instruments (Details Textual) $ in Thousands, $ in Millions, $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 USD ($) | Mar. 31, 2018 USD ($) | Mar. 31, 2019 CAD ($) | Mar. 31, 2019 MXN ($)
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, Ending Balance | $ 4,500 |  |  |
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months | 1,700 |  |  |
Gain (Loss) on Sale of Derivatives | (1,799) | $ 4,007 |  |
Derivative, Gain (Loss) on Derivative, Net, Total | (3,686) | $ 9,094 |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral, Total | 9,000 |  |  |
Derivative, Fair Value, Obligations Under the Agreements | 9,000 |  |  |
Cost of sales and Other Direct Production Costs [Member] |  |  |  |
Gain (Loss) on Sale of Derivatives | (500) |  |  |
Foreign Exchange Contract [Member] | Other Current Assets [Member] |  |  |  |
Derivative Asset, Current | 200 |  |  |
Foreign Exchange Contract [Member] | Other Current Liabilities [Member] |  |  |  |
Derivative Liability, Current | 2,000 |  |  |
Foreign Exchange Contract [Member] | Other Noncurrent Liabilities [Member] |  |  |  |
Derivative Liability, Noncurrent | $ 2,700 |  |  |
Foreign Exchange Contract [Member] | Casa Berardi [Member] | Minimum [Member] | United States of America, Dollars |  |  |  |
Derivative, Forward Exchange Rate | 1.2702 |  | 1.2702 | 1.2702
Foreign Exchange Contract [Member] | Casa Berardi [Member] | Maximum [Member] | United States of America, Dollars |  |  |  |
Derivative, Forward Exchange Rate | 1.3306 |  | 1.3306 | 1.3306
Foreign Exchange Contract [Member] | San Sebastian [Member] | Minimum [Member] | United States of America, Dollars |  |  |  |
Derivative, Forward Exchange Rate | 19.94 |  | 19.94 | 19.94
Foreign Exchange Contract [Member] | San Sebastian [Member] | Maximum [Member] | United States of America, Dollars |  |  |  |
Derivative, Forward Exchange Rate | 20.855 |  | 20.855 | 20.855
Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member] | Casa Berardi [Member] |  |  |  |
Derivative, Number of Instruments Held, Total | 130 |  | 130 | 130
Derivative, Notional Amount | $ 219,600 |  | $ 284.1 |
Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member] | San Sebastian [Member] |  |  |  |
Derivative, Number of Instruments Held, Total | 19 |  | 19 | 19
Derivative, Notional Amount | $ 4,900 |  |  | $ 99.5
Commodity Contract [Member] | Other Current Assets [Member] |  |  |  |
Derivative Asset, Current | 200 |  |  |
Derivative Liability, Current | 100 |  |  |
Commodity Contract [Member] | Other Current Liabilities [Member] |  |  |  |
Derivative Asset, Current | 100 |  |  |
Derivative Liability, Current | 4,000 |  |  |
Commodity Contract [Member] | Other Noncurrent Liabilities [Member] |  |  |  |
Derivative Liability, Noncurrent | 13 |  |  |
Commodity Contract [Member] | Other Noncurrent Assets [Member] |  |  |  |
Derivative Assets, Noncurrent, Total | 45 |  |  |
Unsettled Concentrate Sales Contracts [Member] |  |  |  |
Derivative, Gain (Loss) on Derivative, Net, Total | (2,500) |  |  |
Forecasted Future Concentrate Contracts [Member] |  |  |  |
Derivative, Gain (Loss) on Derivative, Net, Total | $ (1,800) |  |  |

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