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Note 8 - Derivative Instruments - Summary of Forward Sales Contracts (Details) oz in Thousands, lb in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 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 | 2,344 | 1,282
Average price per ounce/pound (in USD per Ounce) | $ / oz | 26.76 | 25.00
Gold 2021 Settlements for Provisional Sales [Member] |  |
Ounces/pounds under contract (Ounce) | oz | 7 | 4
Average price per ounce/pound (in USD per Ounce) | $ / oz | 1,810 | 1,858
Zinc 2021 Settlements for Provisional Sales [Member] |  |
Ounces/pounds under contract (Ounce) | lb | 17,857 | 23,314
Average price per ounce/pound (in USD per Ounce) | $ / lb | 1.32 | 1.19
Lead 2021 Settlements for Provisional Sales [Member] |  |
Ounces/pounds under contract (Ounce) | lb | 11,762 | 4,905
Average price per ounce/pound (in USD per Ounce) | $ / lb | 1.00 | 0.90
Zinc 2021 Settlements for Forecasted Sales [Member] |  |
Ounces/pounds under contract (Ounce) | lb | 15,708 | 41,577
Average price per ounce/pound (in USD per Ounce) | $ / lb | 1.24 | 1.17
Lead 2021 Settlements for Forecasted Sales [Member] |  |
Ounces/pounds under contract (Ounce) | lb | 14,991 | 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 | 66,855 | 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 | 50,982 |
Average price per ounce/pound (in USD per Ounce) | $ / lb | 0.96 |
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 | 52,249 |
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 | 15,047 |
Average price per ounce/pound (in USD per Ounce) | $ / lb | 1.33 |

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