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Note 10 - Derivative Instruments (Details Textual) $ in Thousands, $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2021 CAD ($)
Maximum Allocation of Forecasted CAD-demonimated Operating Costs |  | 75.00% | 75.00%
Forecasted CAD-denominated Operating Costs to be Hedged, Term (Year) |  | 5 years |
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net |  | $ 4,700 |
Gain (Loss) on Components Excluded from Assessment of Foreign Currency Cash Flow Hedge Effectiveness |  | 0 |
Price Risk Cash Flow Hedge Unrealized Gain (Loss) to be Reclassified During Next 12 Months |  | (3,400) |
Other Comprehensive Income (Loss) [Member] |  |  |
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months |  | 2,700 |
Foreign Exchange Contract [Member] |  |  |
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax |  | 5,200 |
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member] |  |  |
Unrealized Gain (Loss) on Derivatives |  | $ (200) |
Foreign Exchange Contract [Member] | Casa Berardi [Member] | Designated as Hedging Instrument [Member] |  |  |
Derivative, Number of Instruments Held, Total |  | 166 | 166
Derivative, Notional Amount |  | $ 245,300 | $ 318.8
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 |  | 1.3753 | 1.3753
Price Risk Derivative [Member] |  |  |
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax |  | $ (14,600) |
Unsettled Concentrate Sales Contracts [Member] |  |  |
Derivative, Gain (Loss) on Derivative, Net, Total |  | (500) |
Forecasted Future Concentrate Contracts [Member] |  |  |
Derivative, Gain (Loss) on Derivative, Net, Total |  | (32,900) |
Derivative, Gain on Derivative | $ 6,700 |  |
Commodity Contract [Member] |  |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral, Total |  | 39,100 |
Derivative, Fair Value, Obligations Under the Agreements |  | $ 39,100 |

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- Definition Amount, after tax, of accumulated gain (loss) on derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=124509347&loc=d3e637-108580 + Details
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