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Note 15 - Properties, Plants, Equipment and Mineral Interests, and Lease Commitments (Details textual) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Capital additions (excluding non-cash items) | $ 223,887 | $ 149,378 | $ 109,048
Finance Lease, Right-of-Use Asset, before Accumulated Amortization | 106,900 | 90,800 |
Finance Lease, Right-of-Use Asset, Accumulated Amortization | 86,500 | 67,700 |
Lucky Friday [Member] |  |  |
Capital additions (excluding non-cash items) | 65,300 |  |
Greens Creek [Member] |  |  |
Capital additions (excluding non-cash items) | 43,500 |  |
Mining Assets, Value Beyond Proven and Probable Reserves (VBPP) | 86,300 | 93,800 |
Casa Berardi [Member] |  |  |
Capital additions (excluding non-cash items) | 70,100 |  |
Mining Assets, Value Beyond Proven and Probable Reserves (VBPP) | 323,600 | 323,600 |
Nevada Operations [Member] |  |  |
Mining Assets, Value Beyond Proven and Probable Reserves (VBPP) | 383,600 | 383,600 |
Keno Hill [Member] |  |  |
Capital additions (excluding non-cash items) | 44,700 |  |
Mining Assets, Value Beyond Proven and Probable Reserves (VBPP) | $ 102,100 | $ 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 -Name Accounting Standards Codification -Section 45 -Paragraph 4 -Subparagraph (a) -SubTopic 20 -Topic 842 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479041/842-20-45-4 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a) -SubTopic 20 -Topic 842 -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-4 + 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 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (a) -SubTopic 20 -Topic 842 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479041/842-20-45-1 + 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 -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 13 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-13 + Details
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