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Note 14 - Properties, Plants, Equipment and Mineral Interests, and Lease Commitments (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Payments to Acquire Property, Plant, and Equipment, Total | $ 109,048 | $ 91,016 | $ 121,421
Finance Lease, Right-of-Use Asset, before Accumulated Amortization | 78,900 | 74,000 |
Finance Lease, Right-of-Use Asset, Accumulated Amortization | 60,600 | 51,700 |
Lucky Friday [Member] |  |  |
Payments to Acquire Property, Plant, and Equipment, Total | 29,885 | 25,776 | 8,989
Greens Creek [Member] |  |  |
Payments to Acquire Property, Plant, and Equipment, Total | 23,883 | 19,685 | 29,570
Mining Assets, Value Beyond Proven and Probable Reserves (VBPP) | 132,600 |  |
Casa Berardi [Member] |  |  |
Payments to Acquire Property, Plant, and Equipment, Total | 49,617 | 40,840 | 36,059
Mining Assets, Value Beyond Proven and Probable Reserves (VBPP) | 323,600 |  |
Nevada Operations [Member] |  |  |
Payments to Acquire Property, Plant, and Equipment, Total | 5,470 | $ 4,003 | $ 42,953
Mining Assets, Value Beyond Proven and Probable Reserves (VBPP) | $ 382,900 |  |

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- Definition The economic value of the estimated cash flows of a mining asset beyond that asset's proven and probable reserves. + References No definition available. + Details
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- Definition Amount of accumulated amortization of right-of-use asset from finance lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918638-209977 + Details
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- Definition Amount, before accumulated amortization, of right-of-use asset from finance lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3213-108585 + Details
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