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Note 15 - Commitments, Contingencies, and Obligations (Details Textual) - USD ($) $ in Thousands |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 14, 2023 | Jul. 12, 2022 | Jul. 31, 2018 | Aug. 31, 2012 | Jun. 30, 2011 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Environmental remediation expense |  |  |  |  |  | $ 7,575 | $ 8,793 | $ 14,571
Lessee, operating lease, liability, to be paid |  |  |  |  |  | 11,616 |  |
Lease Commitments [Member] |  |  |  |  |  |  |  |
Lessee, operating lease, liability, to be paid |  |  |  |  |  | 11,600 |  |
Performance Obligation Commitments [Member] |  |  |  |  |  |  |  |
Surety bonds |  |  |  |  |  | 195,400 |  |
Letters of credit outstanding, amount |  |  |  |  |  | 6,900 |  |
Greens Creek [Member] |  |  |  |  |  |  |  |
Contractual obligation |  |  |  |  |  | 29,800 |  |
Greens Creek [Member] | Purchase Orders and Commitment [Member] |  |  |  |  |  |  |  |
Contractual obligation |  |  |  |  |  | 11,400 |  |
Lucky Friday [Member] |  |  |  |  |  |  |  |
EPA maximum for statutory penalties, per day/violation |  | $ 59,973 |  |  |  |  |  |
EPA maximum for administrative penalties, per day/violation |  | 23,989 |  |  |  |  |  |
EPA maximum for administrative penalties |  | $ 299,989 |  |  |  |  |  |
Lucky Friday [Member] | Purchase Orders and Commitment [Member] |  |  |  |  |  |  |  |
Contractual obligation |  |  |  |  |  | 8,100 |  |
Keno Hill [Member] |  |  |  |  |  |  |  |
Maximum offense charges/fine | $ 100,000 |  |  |  |  |  |  |
Keno Hill [Member] | Purchase Orders and Commitment [Member] |  |  |  |  |  |  |  |
Contractual obligation |  |  |  |  |  | 10,700 |  |
Casa Berardi [Member] | Purchase Orders and Commitment [Member] |  |  |  |  |  |  |  |
Contractual obligation |  |  |  |  |  | 2,800 |  |
Nevada Operations [Member] | Purchase Orders and Commitment [Member] |  |  |  |  |  |  |  |
Contractual obligation |  |  |  |  |  | 3,500 |  |
Johnny M Mine Area near San Mateo, New Mexico [Member] |  |  |  |  |  |  |  |
Payment of response costs |  |  |  | $ 1,100 |  |  |  |
Estimated response costs |  |  | $ 9,600 |  |  |  |  |
Environmental remediation expense |  |  |  | 10,100 |  |  |  |
Johnny M Mine Area near San Mateo, New Mexico [Member] | Environmental Remediation Past Response Costs [Member] |  |  |  |  |  |  |  |
Accrual for environmental loss contingencies, period increase (decrease) |  |  |  | $ 10,100 |  | $ 10,100 |  |
Carpenter Snow Creek Superfund Site, Cascade County, Montana [Member] |  |  |  |  |  |  |  |
Estimated response costs |  |  |  |  | $ 4,500 |  |  |
Estimated future response cost |  |  |  |  | $ 100,000 |  |  |

X
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- Definition Increase (decrease) in the accrual for environmental loss contingencies during the reporting period. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.Y.Q1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480102/450-20-S99-1 + Details
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