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Note 11 - Derivative Instruments (Details Textual) $ in Thousands, $ in Millions, $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Oct. 31, 2019 USD ($) $ / oz | Sep. 30, 2019 MXN ($) | Sep. 30, 2019 CAD ($)
Maximum Allocation of Forecasted CAD-demonimated Operating Costs | 75.00% |  | 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 | $ (4,300) |  | $ (4,300) |  |  |  |
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months | (1,300) |  | (1,300) |  |  |  |
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net |  |  | (1,200) |  |  |  |
Derivative, Net Hedge Ineffectiveness Gain (Loss) |  |  | 0 |  |  |  |
Derivative, Gain (Loss) on Derivative, Net, Total |  |  | (5,824) | $ 15,208 |  |  |
Gain (Loss) on Sale of Derivatives | (4,718) | $ 19,460 | (2,719) | $ 40,271 |  |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral, Total | 12,400 |  | 12,400 |  |  |  |
Derivative, Fair Value, Obligations Under the Agreements | 12,400 |  | 12,400 |  |  |  |
Foreign Exchange Contract [Member] | Other Current Assets [Member] |  |  |  |  |  |  |
Derivative Asset, Current | 100 |  | 100 |  |  |  |
Foreign Exchange Contract [Member] | Other Current Liabilities [Member] |  |  |  |  |  |  |
Derivative Assets, Noncurrent, Total | 1,400 |  | 1,400 |  |  |  |
Foreign Exchange Contract [Member] | Other Noncurrent Liabilities [Member] |  |  |  |  |  |  |
Derivative Liability, Noncurrent | $ 2,900 |  | $ 2,900 |  |  |  |
Foreign Exchange Contract [Member] | Casa Berardi [Member] | Minimum [Member] |  |  |  |  |  |  |
Derivative, Forward Exchange Rate | 1.2702 |  | 1.2702 |  |  | 1.2702 | 1.2702
Foreign Exchange Contract [Member] | Casa Berardi [Member] | Maximum [Member] |  |  |  |  |  |  |
Derivative, Forward Exchange Rate | 1.3332 |  | 1.3332 |  |  | 1.3332 | 1.3332
Foreign Exchange Contract [Member] | Casa Berardi [Member] | Designated as Hedging Instrument [Member] |  |  |  |  |  |  |
Derivative, Number of Instruments Held, Total | 135 |  | 135 |  |  | 135 | 135
Derivative, Notional Amount | $ 231,500 |  | $ 231,500 |  |  |  | $ 300.7
Foreign Exchange Contract [Member] | San Sebastian [Member] | Minimum [Member] |  |  |  |  |  |  |
Derivative, Forward Exchange Rate | 20.4100 |  | 20.4100 |  |  | 20.4100 | 20.4100
Foreign Exchange Contract [Member] | San Sebastian [Member] | Maximum [Member] |  |  |  |  |  |  |
Derivative, Forward Exchange Rate | 20.8550 |  | 20.8550 |  |  | 20.8550 | 20.8550
Foreign Exchange Contract [Member] | San Sebastian [Member] | Designated as Hedging Instrument [Member] |  |  |  |  |  |  |
Derivative, Number of Instruments Held, Total | 10 |  | 10 |  |  | 10 | 10
Derivative, Notional Amount | $ 1,800 |  | $ 1,800 |  |  | $ 37.3 |
Silver Contracts [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Derivative, Average Price Risk Option Strike Price | $ / oz |  |  |  |  | 16.00 |  |
Gold Contracts [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Derivative, Notional Amount |  |  |  |  | $ 3,200 |  |
Derivative, Average Price Risk Option Strike Price | $ / oz |  |  |  |  | 1,450 |  |
Commodity Contract [Member] |  |  |  |  |  |  |
Derivative Asset, Current | 1,100 |  | 1,100 |  |  |  |
Derivative Asset, Total | 700 |  | 700 |  |  |  |
Derivative Liability, Current | 7,100 |  | 7,100 |  |  |  |
Derivative Liability, Total | 400 |  | 400 |  |  |  |
Unsettled Concentrate Sales Contracts [Member] |  |  |  |  |  |  |
Derivative, Gain (Loss) on Derivative, Net, Total |  |  | (100) |  |  |  |
Forecasted Future Concentrate Contracts [Member] |  |  |  |  |  |  |
Derivative, Gain (Loss) on Derivative, Net, Total |  |  | $ 2,700 |  |  |  |
Gain (Loss) on Sale of Derivatives | $ 6,700 | $ 32,800 |  |  |  |  |

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