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Note 4 - Business Segments, Sales of Products and Significant Customers (Details Textual) $ in Thousands, lb in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 USD ($) oz lb | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Number of Reportable Segments | 4 |  |
Derivative, Loss on Derivative | $ 500 | $ 16,400 | $ 1,300
Accounts Receivable, after Allowance for Credit Loss, Current, Total | $ 36,437 | 27,864 |
Accounts Receivable, Allowance for Credit Loss, Ending Balance |  | $ 0 |
Silver Contracts [Member] |  |  |
Metals Contained in Concentrates (Ounce) | oz | 2.1 |  |
Gold [Member] |  |  |
Metals Contained in Concentrates (Ounce) | oz | 6,224 |  |
Zinc [Member] |  |  |
Metals Contained in Concentrates (Ounce) | lb | 27.5 |  |
Lead [Member] |  |  |
Metals Contained in Concentrates (Ounce) | lb | 12.7 |  |

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- Definition Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124259787&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=124098289&loc=d3e6676-107765 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=124259787&loc=d3e4531-111522 + Details
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