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Note 9 - Derivative Instruments - Summary of Forward Sales Contracts (Details) oz in Thousands, lb in Thousands | 12 Months Ended
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Dec. 31, 2022 lb oz $ / $ $ / oz | Dec. 31, 2021 oz lb $ / $ $ / oz
Silver 2022 Settlements for Provisional Sales [Member] |  |
Derivative, Nonmonetary Notional Amount, Mass | oz |  | 1,814
Underlying, Derivative Mass | $ / oz |  | 23.02
Silver 2023 Settlements for Provisional Sales [Member] |  |
Derivative, Nonmonetary Notional Amount, Mass | oz | 3,124 |
Underlying, Derivative Mass | $ / oz | 21.55 |
Gold 2022 Settlements for Provisional Sales [Member] |  |
Derivative, Nonmonetary Notional Amount, Mass | oz |  | 6
Underlying, Derivative Mass | $ / oz |  | 1,812
Gold 2023 Settlements for Provisional Sales [Member] |  |
Derivative, Nonmonetary Notional Amount, Mass | oz | 8 |
Underlying, Derivative Mass | $ / oz | 1,795 |
Zinc 2022 Settlements for Provisional Sales [Member] |  |
Derivative, Nonmonetary Notional Amount, Mass |  | 13,371
Underlying, Derivative Mass | $ / $ |  | 1.39
Lead 2022 Settlements for Provisional Sales [Member] |  |
Derivative, Nonmonetary Notional Amount, Mass |  | 4,575
Underlying, Derivative Mass | $ / $ |  | 0.96
Zinc 2022 Settlements for Forecasted Sales [Member] |  |
Derivative, Nonmonetary Notional Amount, Mass |  | 57,706
Underlying, Derivative Mass | $ / $ | 1.34 | 1.28
Lead 2022 Settlements for Forecasted Sales [Member] |  |
Derivative, Nonmonetary Notional Amount, Mass |  | 59,194
Underlying, Derivative Mass | $ / $ | 1.00 | 0.98
Zinc 2023 Settlements for Forecasted Sales [Member] |  |
Derivative, Nonmonetary Notional Amount, Mass | 37,533 | 76,280
Underlying, Derivative Mass | $ / $ |  | 1.29
Zinc 2023 Settlements for Provisional Sales [Member] |  |
Derivative, Nonmonetary Notional Amount, Mass | 18,629 |
Underlying, Derivative Mass | $ / $ | 1.38 |
Zinc 2024 Settlements for Forecasted Sales [Member] |  |
Derivative, Nonmonetary Notional Amount, Mass | 0 |
Lead 2023 Settlements for Forecasted Sales [Member] |  |
Derivative, Nonmonetary Notional Amount, Mass | 75,618 | 71,650
Underlying, Derivative Mass | $ / $ |  | 1.00
Lead 2023 Settlements for Provisional Sales [Member] |  |
Derivative, Nonmonetary Notional Amount, Mass | 11,960 |
Underlying, Derivative Mass | $ / $ | 0.98 |
Lead 2024 Settlements for Forecasted Sales [Member] |  |
Derivative, Nonmonetary Notional Amount, Mass | 45,856 |
Underlying, Derivative Mass | $ / $ | 0.99 |

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