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Note 11 - Derivative Instruments (Details Textual) $ in Thousands, $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) oz $ / oz | Sep. 30, 2019 USD ($) | Sep. 30, 2020 CAD ($) $ / oz | Dec. 31, 2019 USD ($)
Maximum Allocation of Forecasted CAD-demonimated Operating Costs |  | 75.00% |  | 75.00% |
Forecasted CAD-denominated Operating Costs to be Hedged, Term (Year) |  | 5 years |  |  |
Derivative Liability, Current |  | $ 12,232 |  |  | $ 6,170
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax, Ending Balance |  | (1,400) |  |  |
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net |  | 2,800 |  |  |
Gain (Loss) on Components Excluded from Assessment of Foreign Currency Cash Flow Hedge Effectiveness |  | 0 |  |  |
Derivative, Gain (Loss) on Derivative, Net, Total |  | (4,483) | $ (5,824) |  |
Other Comprehensive Income (Loss) [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax, Ending Balance |  | (3,100) |  |  |
Foreign Exchange Contract [Member] | Other Current Assets [Member] |  |  |  |  |
Derivative Asset, Current |  | 500 |  |  |
Foreign Exchange Contract [Member] | Other Noncurrent Assets [Member] |  |  |  |  |
Derivative Assets, Noncurrent, Total |  | 500 |  |  |
Foreign Exchange Contract [Member] | Other Current Liabilities [Member] |  |  |  |  |
Derivative Liability, Current |  | 2,000 |  |  |
Foreign Exchange Contract [Member] | Other Noncurrent Liabilities [Member] |  |  |  |  |
Derivative Liability, Noncurrent |  | $ 2,100 |  |  |
Foreign Exchange Contract [Member] | Casa Berardi [Member] | Designated as Hedging Instrument [Member] |  |  |  |  |
Derivative, Number of Instruments Held, Total |  | 143 |  | 143 |
Derivative, Notional Amount |  | $ 235,900 |  | $ 310.3 |
Foreign Exchange Contract [Member] | Casa Berardi [Member] | Designated as Hedging Instrument [Member] | Minimum [Member] |  |  |  |  |
Derivative, Forward Exchange Rate |  | 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 |
Foreign Exchange Contract [Member] | San Sebastian [Member] | Designated as Hedging Instrument [Member] |  |  |  |  |
Derivative, Number of Instruments Held, Total |  | 0 |  | 0 |
Silver Contracts [Member] |  |  |  |  |
Derivative, Average Price Risk Option Strike Price (in USD per Ounce) | $ / oz |  | 16.13 |  | 16.13 |
Derivative, Nonmonetary Notional Amount, Mass (Ounce) | oz |  | 3,900,000 |  |  |
Gold Contracts [Member] |  |  |  |  |
Derivative, Average Price Risk Option Strike Price (in USD per Ounce) | $ / oz |  | 1,625 |  | 1,625 |
Derivative, Nonmonetary Notional Amount, Mass (Ounce) | oz |  | 50,511 |  |  |
Commodity Contract [Member] |  |  |  |  |
Derivative Liability, Current |  | $ 10,200 |  |  |
Derivative Liability, Noncurrent |  | 45 |  |  |
Derivative Liability, Total |  | 1,800 |  |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral, Total |  | 16,200 |  |  |
Derivative, Fair Value, Obligations Under the Agreements |  | 16,200 |  |  |
Unsettled Concentrate Sales Contracts [Member] |  |  |  |  |
Derivative, Gain (Loss) on Derivative, Net, Total |  | 12,900 |  |  |
Forecasted Future Concentrate Contracts [Member] |  |  |  |  |
Derivative, Gain (Loss) on Derivative, Net, Total | $ 6,700 | $ 12,800 |  |  |

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