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Note 10 - Derivative Instruments - Summary of Forward Sales Contracts (Details) | 12 Months Ended
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Dec. 31, 2021 lb g $ / lb $ / item | Dec. 31, 2020 oz lb $ / lb $ / oz
Silver 2022 Settlements for Provisional Sales [Member] |  |
Ounces/pounds under contract (Pound) | oz |  | 1,282
Average price per ounce/pound (in USD per Pound) | $ / oz |  | 25.00
Gold 2022 Settlements for Provisional Sales [Member] |  |
Ounces/pounds under contract (Pound) | oz |  | 4
Average price per ounce/pound (in USD per Pound) | $ / oz |  | 1,858
Zinc 2022 Settlements for Provisional Sales [Member] |  |
Ounces/pounds under contract (Pound) | lb | 13,371 | 23,314
Average price per ounce/pound (in USD per Pound) | $ / lb | 1.39 | 1.19
Lead 2022 Settlements for Provisional Sales [Member] |  |
Ounces/pounds under contract (Pound) | lb | 4,575 | 4,905
Average price per ounce/pound (in USD per Pound) | $ / lb | 0.96 | 0.90
Zinc 2022 Settlements for Forecasted Sales [Member] |  |
Ounces/pounds under contract (Pound) | lb | 57,706 | 41,577
Average price per ounce/pound (in USD per Pound) | $ / lb | 1.28 | 1.17
Lead 2022 Settlements for Forecasted Sales [Member] |  |
Ounces/pounds under contract (Pound) | lb | 59,194 | 30,876
Average price per ounce/pound (in USD per Pound) | $ / lb | 0.98 | 0.88
Zinc 2023 Settlements for Forecasted Sales [Member] |  |
Ounces/pounds under contract (Pound) | lb | 76,280 | 18,519
Average price per ounce/pound (in USD per Pound) | $ / lb | 1.29 | 1.28
Lead 2023 Settlements for Forecasted Sales [Member] |  |
Ounces/pounds under contract (Pound) | g | 71,650 |
Average price per ounce/pound (in USD per Pound) | $ / item | 1.00 |

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- Definition Specified interest rate, security price, commodity price, foreign exchange rate, index of prices or rates for a derivative contract measured in mass but not the derivative contract itself. + References No definition available. + Details
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