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Note 15 - Properties, Plants, Equipment and Mine Development, net, and Lease Commitments (Details textual) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023
Capital additions (excluding non-cash items) | $ 214.5 |
Finance Lease, Right-of-Use Asset, before Accumulated Amortization | 108.5 | $ 106.9
Finance Lease, Right-of-Use Asset, Accumulated Amortization | 94.4 | 86.5
Lucky Friday [Member] |  |
Capital additions (excluding non-cash items) | 49.6 |
Greens Creek [Member] |  |
Capital additions (excluding non-cash items) | 47.8 |
Mining Assets, Value Beyond Proven and Probable Reserves (VBPP) | 83.3 | 86.3
Casa Berardi [Member] |  |
Capital additions (excluding non-cash items) | 60.7 |
Mining Assets, Value Beyond Proven and Probable Reserves (VBPP) | 323.6 | 323.6
Nevada Operations [Member] |  |
Mining Assets, Value Beyond Proven and Probable Reserves (VBPP) | 388.2 | 383.6
Keno Hill [Member] |  |
Capital additions (excluding non-cash items) | 54.9 |
Mining Assets, Value Beyond Proven and Probable Reserves (VBPP) | $ 95.7 | $ 102.1

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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 for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 805 -SubTopic 50 -Name Accounting Standards Codification -Section 25 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480060/805-50-25-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 805 -SubTopic 50 -Name Accounting Standards Codification -Section 30 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480027/805-50-30-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 805 -SubTopic 50 -Name Accounting Standards Codification -Section 30 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480027/805-50-30-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 45 -Paragraph 13 -Subparagraph (c) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-13 + Details
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