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Note 10 - Commitments, Contingencies and Obligations (Details Textual) - USD ($) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Jul. 12, 2022 | Jul. 31, 2018 | Aug. 31, 2012 | Jun. 30, 2011 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Environmental remediation expense |  |  |  |  | $ 2,256 | $ 1,781 | $ 6,411 | $ 4,154
Finance lease, liability, to be paid |  |  |  |  | 32,161 |  | 32,161 |
Lessee, operating lease, liability, to be paid |  |  |  |  | 12,439 |  | 12,439 |
Lease Commitments [Member] |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Lessee, operating lease, liability, to be paid |  |  |  |  | 12,400 |  | 12,400 |
Performance Obligation Commitments [Member] |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Surety Bonds |  |  |  |  | 193,400 |  | 193,400 |
Letters of credit outstanding, amount |  |  |  |  | 6,700 |  | 6,700 |
Greens Creek [Member] |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Contractual obligation |  |  |  |  | 32,200 |  | 32,200 |
Greens Creek [Member] | Purchase Orders and Commitment [Member] |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Contractual obligation |  |  |  |  | 15,000 |  | 15,000 |
Lucky Friday [Member] |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Contractual obligation |  |  |  |  | 9,700 |  | 9,700 |
Casa Berardi [Member] | Purchase Orders and Commitment [Member] |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Contractual obligation |  |  |  |  | 3,500 |  | 3,500 |
Nevada Operations [Member] | Purchase Orders and Commitment [Member] |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Contractual obligation |  |  |  |  | 1,800 |  | 1,800 |
Keno Hill [Member] | Purchase Orders and Commitment [Member] |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Contractual obligation |  |  |  |  | $ 10,300 |  | 10,300 |
Johnny M Mine Area near San Mateo, New Mexico [Member] |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Accrual for environmental loss contingencies, period increase (decrease) |  |  | $ 10,100 |  |  |  | $ 10,100 |
Carpenter Snow Creek Superfund Site, Cascade County, Montana [Member] |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Estimated response costs |  |  |  | $ 4,500 |  |  |  |
Estimated future response cost |  |  |  | $ 100,000 |  |  |  |

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