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Note 9 - Derivative Instruments - Summary of Forward Sales Contracts (Details) oz in Thousands, lb in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 oz lb $ / oz $ / lb | Dec. 31, 2020 oz lb $ / oz $ / lb
Silver 2021 Settlements for Provisional Sales [Member] |  |
Ounces/pounds under contract (Ounce) | oz | 1,190 | 1,282
Average price per ounce/pound (in USD per Ounce) | $ / oz | 23.15 | 25.00
Gold 2021 Settlements for Provisional Sales [Member] |  |
Ounces/pounds under contract (Ounce) | oz | 4 | 4
Average price per ounce/pound (in USD per Ounce) | $ / oz | 1,776 | 1,858
Zinc 2021 Settlements for Provisional Sales [Member] |  |
Ounces/pounds under contract (Ounce) | lb | 20,867 | 23,314
Average price per ounce/pound (in USD per Ounce) | $ / lb | 1.35 | 1.19
Lead 2021 Settlements for Provisional Sales [Member] |  |
Ounces/pounds under contract (Ounce) | lb | 9,866 | 4,905
Average price per ounce/pound (in USD per Ounce) | $ / lb | 1.01 | 0.90
Zinc 2021 Settlements for Forecasted Sales [Member] |  |
Ounces/pounds under contract (Ounce) | lb | 7,771 | 41,577
Average price per ounce/pound (in USD per Ounce) | $ / lb | 1.26 | 1.17
Lead 2021 Settlements for Forecasted Sales [Member] |  |
Ounces/pounds under contract (Ounce) | lb | 6,779 | 30,876
Average price per ounce/pound (in USD per Ounce) | $ / lb | 0.94 | 0.88
Zinc 2022 Settlements for Forecasted Sales [Member] |  |
Ounces/pounds under contract (Ounce) | lb | 60,043 | 18,519
Average price per ounce/pound (in USD per Ounce) | $ / lb | 1.28 | 1.28
Lead 2022 Settlements for Forecasted Sales [Member] |  |
Ounces/pounds under contract (Ounce) | lb | 63,769 |
Average price per ounce/pound (in USD per Ounce) | $ / lb | 0.98 |
Zinc 2023 Settlements for Provisional Sales [Member] |  |
Ounces/pounds under contract (Ounce) | lb | 76,280 |
Average price per ounce/pound (in USD per Ounce) | $ / lb | 1.29 |
Lead 2023 Settlements for Provisional Sales [Member] |  |
Ounces/pounds under contract (Ounce) | lb | 70,327 |
Average price per ounce/pound (in USD per Ounce) | $ / lb | 1.00 |
Zinc 2024 Settlements for Forecasted Sales [Member] |  |
Ounces/pounds under contract (Ounce) | lb | 43,762 |
Average price per ounce/pound (in USD per Ounce) | $ / lb | 1.31 |

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