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Note 8 - Derivative Instruments (Details Textual) $ in Thousands, $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) oz | Jun. 30, 2020 USD ($) | Dec. 31, 2020 oz $ / oz | Jun. 30, 2021 CAD ($)
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 | $ 11,100 |  | $ 11,100 |  |  |
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net |  |  | 2,000 |  |  |
Gain (Loss) on Components Excluded from Assessment of Foreign Currency Cash Flow Hedge Effectiveness |  |  | 0 |  |  |
Derivative, Gain (Loss) on Derivative, Net, Total |  |  | (2,116) | $ (11,188) |  |
Other Comprehensive Income (Loss) [Member] |  |  |  |  |  |
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months | $ 6,000 |  | $ 6,000 |  |  |
Foreign Exchange Contract [Member] | Casa Berardi [Member] | Designated as Hedging Instrument [Member] |  |  |  |  |  |
Derivative, Number of Instruments Held, Total | 117 |  | 117 |  |  | 117
Derivative, Notional Amount | $ 170,500 |  | $ 170,500 |  |  | $ 224.8
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 | 1.3779 |  | 1.3779 |  |  | 1.3779
Silver Contracts [Member] |  |  |  |  |  |
Derivative, Average Price Risk Option Strike Price (in USD per Ounce) | $ / oz |  |  |  |  | 16.50 |
Derivative, Nonmonetary Notional Amount, Mass (Ounce) | oz |  |  |  |  | 1,100,000 |
Gold Contracts [Member] |  |  |  |  |  |
Derivative, Average Price Risk Option Strike Price (in USD per Ounce) | $ / oz |  |  |  |  | 1,650 |
Derivative, Nonmonetary Notional Amount, Mass (Ounce) | oz |  |  | 0 |  | 12,992 |
Unsettled Concentrate Sales Contracts [Member] |  |  |  |  |  |
Derivative, Gain (Loss) on Derivative, Net, Total | $ 3,300 | $ 5,000 | $ 500 | 3,300 |  |
Forecasted Future Concentrate Contracts [Member] |  |  |  |  |  |
Derivative, Gain (Loss) on Derivative, Net, Total | 17,300 | $ 14,000 | 16,800 | $ 6,100 |  |
Commodity Contract [Member] |  |  |  |  |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral, Total | 17,100 |  | 17,100 |  |  |
Derivative, Fair Value, Obligations Under the Agreements | $ 17,100 |  | $ 17,100 |  |  |

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