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Note 8 - Derivative Instruments - Summary of Forward Sales Contracts (Details) oz in Thousands, lb in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 oz lb $ / oz $ / lb $ / item | Dec. 31, 2021 oz lb $ / oz $ / lb $ / item
Silver 2022 Settlements for Provisional Sales [Member] |  |
Ounces/pounds under contract (Ounce) | oz | 1,573 | 1,814
Average price per ounce/pound (in USD per Ounce) | $ / oz | 24.73 | 23.02
Gold 2022 Settlements for Provisional Sales [Member] |  |
Ounces/pounds under contract (Ounce) | oz | 5 | 6
Average price per ounce/pound (in USD per Ounce) | $ / oz | 1,912 | 1,812
Zinc 2022 Settlements for Provisional Sales [Member] |  |
Ounces/pounds under contract (Ounce) | lb | 16,976 | 13,371
Average price per ounce/pound (in USD per Ounce) | $ / lb | 1.27 | 1.39
Lead 2022 Settlements for Provisional Sales [Member] |  |
Ounces/pounds under contract (Ounce) | lb | 5,732 | 4,575
Average price per ounce/pound (in USD per Ounce) | $ / lb | 0.97 | 0.96
Silver 2022 Settlements for Forecasted Sales [Member] |  |
Ounces/pounds under contract (Ounce) | oz | 0 | 0
Gold 2022 Settlements for Forecasted Sales [Member] |  |
Ounces/pounds under contract (Ounce) | oz | 0 | 0
Zinc 2022 Settlements for Forecasted Sales [Member] |  |
Ounces/pounds under contract (Ounce) | lb | 37,644 | 57,706
Average price per ounce/pound (in USD per Ounce) | $ / lb | 1.31 | 1.28
Lead 2022 Settlements for Forecasted Sales [Member] |  |
Ounces/pounds under contract (Ounce) | lb | 46,517 | 59,194
Average price per ounce/pound (in USD per Ounce) | $ / lb | 0.98 | 0.98
Silver 2023 Settlements for Forecasted Sales [Member] |  |
Ounces/pounds under contract (Ounce) | oz | 0 | 0
Gold 2023 Settlements for Forecasted Sales [Member] |  |
Ounces/pounds under contract (Ounce) | oz | 0 | 0
Zinc 2023 Settlements for Forecasted Sales [Member] |  |
Ounces/pounds under contract (Ounce) | lb | 78,264 | 76,280
Average price per ounce/pound (in USD per Ounce) | $ / lb | 1.30 | 1.29
Lead 2023 Settlements for Forecasted Sales [Member] |  |
Ounces/pounds under contract (Ounce) | lb | 75,618 | 71,650
Average price per ounce/pound (in USD per Ounce) | $ / item | 1.00 | 1.00
Silver 2024 Settlements for Forecasted Sales [Member] |  |
Ounces/pounds under contract (Ounce) | oz | 0 |
Gold 2024 Settlements for Forecasted Sales [Member] |  |
Ounces/pounds under contract (Ounce) | oz | 0 |
Zinc 2024 Settlements for Forecasted Sales [Member] |  |
Ounces/pounds under contract (Ounce) | lb | 64,650 |
Average price per ounce/pound (in USD per Ounce) | $ / item | 1.32 |
Lead 2024 Settlements for Forecasted Sales [Member] |  |
Ounces/pounds under contract (Ounce) | lb | 23,149 |
Average price per ounce/pound (in USD per Ounce) | $ / item | 1.01 |

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