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Note 14 - Commitments, Contingencies, and Obligations (Details Textual) - USD ($) $ in Thousands |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jul. 12, 2022 | Jun. 30, 2022 | Jul. 31, 2018 | Aug. 31, 2012 | Jun. 30, 2011 | Mar. 31, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Environmental Remediation Expense |  |  |  |  |  |  | $ 8,793 | $ 14,571 | $ 3,929
Finance Lease, Liability, Payment, Due, Total |  |  |  |  |  |  | 22,220 |  |
Lessee, Operating Lease, Liability, to be Paid, Total |  |  |  |  |  |  | 14,579 |  |
Lease Commitments [Member] |  |  |  |  |  |  |  |  |
Finance Lease, Liability, Payment, Due, Total |  |  |  |  |  |  | 22,200 |  |
Lessee, Operating Lease, Liability, to be Paid, Total |  |  |  |  |  |  | 14,600 |  |
Performance Obligation Commitments [Member] |  |  |  |  |  |  |  |  |
Surety Bonds |  |  |  |  |  |  | 192,700 |  |
Letters of Credit Outstanding, Amount |  |  |  |  |  |  | 7,800 |  |
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, Total | $ 299,989 |  |  |  |  |  |  |  |
Contractual Obligation, Total |  |  |  |  |  |  | 22,800 |  |
Casa Berardi [Member] |  |  |  |  |  |  |  |  |
Contractual Obligation, Total |  |  |  |  |  |  | 1,700 |  |
Greens Creek [Member] |  |  |  |  |  |  |  |  |
EPA Maximum for Statutory Penalties, Per Day/Violation |  | $ 81,540 |  |  |  |  |  |  |
EPA Maximum for Administrative Penalties, Per Day/Violation |  | $ 47,423 |  |  |  |  |  |  |
Contractual Obligation, Total |  |  |  |  |  |  | 9,800 |  |
Nevada Operations [Member] |  |  |  |  |  |  |  |  |
Contractual Obligation, Total |  |  |  |  |  |  | 1,900 |  |
Keno Hill [Member] |  |  |  |  |  |  |  |  |
Contractual Obligation, Total |  |  |  |  |  |  | $ 4,500 |  |
Johnny M Mine Area near San Mateo, New Mexico [Member] |  |  |  |  |  |  |  |  |
Payment Of Response Costs |  |  |  | $ 1,100 |  |  |  |  |
Estimated Response Costs |  |  | $ 9,600 |  |  | $ 9,000 |  |  |
Environmental Remediation Expense |  |  |  |  |  | 9,000 |  |  |
Johnny M Mine Area near San Mateo, New Mexico [Member] | Environmental Remediation Past Response Costs [Member] |  |  |  |  |  |  |  |  |
Accrual for Environmental Loss Contingencies, Period Increase (Decrease) |  |  |  |  |  | $ 2,900 |  |  |
Carpenter Snow Creek Superfund Site, Cascade County, Montana [Member] |  |  |  |  |  |  |  |  |
Estimated Response Costs |  |  |  |  | $ 4,500 |  |  |  |
Estimated Future Response Cost |  |  |  |  | $ 100,000 |  |  |  |

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