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Note 11 - Derivative Instruments (Details Textual) $ in Thousands, $ in Millions, $ in Millions | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2020 USD ($) | Mar. 31, 2019 USD ($) | May 07, 2020 $ / item | Apr. 30, 2020 USD ($) $ / item | Mar. 31, 2020 CAD ($) | Mar. 31, 2020 MXN ($)
Maximum Allocation of Forecasted CAD-demonimated Operating Costs | 75.00% |  |  |  | 75.00% | 75.00%
Forecasted CAD-denominated Operating Costs to be Hedged, Term (Year) | 5 years |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax, Ending Balance | $ (19,700) |  |  |  |  |
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net | 900 |  |  |  |  |
Gain (Loss) on Components Excluded from Assessment of Foreign Currency Cash Flow Hedge Effectiveness | 0 |  |  |  |  |
Derivative, Gain (Loss) on Derivative, Net, Total | 10,437 | $ (3,686) |  |  |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral, Total | 20,700 |  |  |  |  |
Derivative, Fair Value, Obligations Under the Agreements | 20,700 |  |  |  |  |
Other Comprehensive Income (Loss) [Member] |  |  |  |  |  |
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months | (7,000) |  |  |  |  |
Foreign Exchange Contract [Member] | Other Current Liabilities [Member] |  |  |  |  |  |
Derivative Liability, Current | 7,500 |  |  |  |  |
Foreign Exchange Contract [Member] | Other Noncurrent Liabilities [Member] |  |  |  |  |  |
Derivative Liability, Noncurrent | $ 12,000 |  |  |  |  |
Foreign Exchange Contract [Member] | Casa Berardi [Member] | Designated as Hedging Instrument [Member] |  |  |  |  |  |
Derivative, Number of Instruments Held, Total | 155 |  |  |  | 155 | 155
Derivative, Notional Amount | $ 262,900 |  |  |  | $ 345 |
Foreign Exchange Contract [Member] | Casa Berardi [Member] | Designated as Hedging Instrument [Member] | Minimum [Member] |  |  |  |  |  |
Derivative, Forward Exchange Rate | 1.2702 |  |  |  | 1.2702 | 1.2702
Foreign Exchange Contract [Member] | Casa Berardi [Member] | Designated as Hedging Instrument [Member] | Maximum [Member] |  |  |  |  |  |
Derivative, Forward Exchange Rate | 1.3785 |  |  |  | 1.3785 | 1.3785
Foreign Exchange Contract [Member] | San Sebastian [Member] | Designated as Hedging Instrument [Member] |  |  |  |  |  |
Derivative, Number of Instruments Held, Total | 2 |  |  |  | 2 | 2
Derivative, Notional Amount | $ 200 |  |  |  |  | $ 3.2
Foreign Exchange Contract [Member] | San Sebastian [Member] | Designated as Hedging Instrument [Member] | Minimum [Member] |  |  |  |  |  |
Derivative, Forward Exchange Rate | 20.8125 |  |  |  | 20.8125 | 20.8125
Foreign Exchange Contract [Member] | San Sebastian [Member] | Designated as Hedging Instrument [Member] | Maximum [Member] |  |  |  |  |  |
Derivative, Forward Exchange Rate | 20.8450 |  |  |  | 20.8450 | 20.8450
Gold Contracts [Member] | Subsequent Event [Member] |  |  |  |  |  |
Derivative, Notional Amount |  |  |  | $ 1,700 |  |
Derivative, Average Price Risk Option Strike Price (in USD per Per Share) | $ / item |  |  |  | 1,600 |  |
Silver Contracts [Member] | Subsequent Event [Member] |  |  |  |  |  |
Derivative, Average Price Risk Option Strike Price (in USD per Per Share) | $ / item |  |  | 0 |  |  |
Commodity Contract [Member] |  |  |  |  |  |
Derivative Liability, Current | $ 100 |  |  |  |  |
Derivative Asset, Current | 8,800 |  |  |  |  |
Derivative Asset, Total | 800 |  |  |  |  |
Derivative Liability, Total | 400 |  |  |  |  |
Unsettled Concentrate Sales Contracts [Member] |  |  |  |  |  |
Derivative, Gain (Loss) on Derivative, Net, Total | 1,700 |  |  |  |  |
Forecasted Future Concentrate Contracts [Member] |  |  |  |  |  |
Derivative, Gain (Loss) on Derivative, Net, Total | $ 7,900 |  |  |  |  |

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