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Note 13 - Properties, Plants, Equipment and Mineral Interests, and Lease Commitments (Details textual) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Capital additions (excluding non-cash items) | $ 149,378 | $ 109,048 | $ 91,016
Finance Lease, Right-of-Use Asset, before Accumulated Amortization | 90,800 | 78,900 |
Finance Lease, Right-of-Use Asset, Accumulated Amortization | 67,700 | 60,600 |
Lucky Friday [Member] |  |  |
Capital additions (excluding non-cash items) | 50,992 | 29,885 | 25,776
Greens Creek [Member] |  |  |
Capital additions (excluding non-cash items) | 36,898 | 23,883 | 19,685
Mining Assets, Value Beyond Proven and Probable Reserves (VBPP) | 93,800 | 132,600 |
Casa Berardi [Member] |  |  |
Capital additions (excluding non-cash items) | 39,667 | 49,617 | 40,840
Mining Assets, Value Beyond Proven and Probable Reserves (VBPP) | 323,600 | 323,600 |
Nevada Operations [Member] |  |  |
Capital additions (excluding non-cash items) | 333 | 5,470 | 4,003
Mining Assets, Value Beyond Proven and Probable Reserves (VBPP) | 383,600 | 382,900 |
Keno Hill [Member] |  |  |
Capital additions (excluding non-cash items) | 19,725 | $ 0 | $ 0
Mining Assets, Value Beyond Proven and Probable Reserves (VBPP) | $ 102,100 |  |

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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 https://asc.fasb.org/extlink&oid=128292326&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 https://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 https://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 https://asc.fasb.org/extlink&oid=126954810&loc=d3e3213-108585 + Details
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