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Note 10 - Commitments, Contingencies and Obligations (Details Textual) - USD ($) $ in Thousands |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | ---
May 24, 2023 | Jul. 12, 2022 | Jul. 31, 2018 | Aug. 31, 2012 | Jun. 30, 2011 | Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Environmental remediation expense |  |  |  |  |  | $ 3,111 | $ 1,472 | $ 4,155 | $ 2,373
Finance lease, liability, to be paid |  |  |  |  |  | 35,927 |  | 35,927 |
Lessee, operating lease, liability, to be paid |  |  |  |  |  | 13,215 |  | 13,215 |
Lease Commitments [Member] |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Lessee, operating lease, liability, to be paid |  |  |  |  |  | 13,200 |  | 13,200 |
Performance Obligation Commitments [Member] |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Surety Bonds |  |  |  |  |  | 193,200 |  | 193,200 |
Letters of credit outstanding, amount |  |  |  |  |  | 6,800 |  | 6,800 |
Greens Creek [Member] |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Terms of settlement included fine | $ 100 |  |  |  |  |  |  |  |
Contractual obligation |  |  |  |  |  | 35,900 |  | 35,900 |
Greens Creek [Member] | Purchase Orders and Commitment [Member] |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Contractual obligation |  |  |  |  |  | 16,500 |  | 16,500 |
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 |  |  |  |  |  | 20,800 |  | 20,800 |
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 |  |  |  |  |  | 2,300 |  | 2,300 |
Keno Hill [Member] | Purchase Orders and Commitment [Member] |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Contractual obligation |  |  |  |  |  | $ 10,500 |  | 10,500 |
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 |
Johnny M Mine Area near San Mateo, New Mexico [Member] | Environmental Remediation Past Response Costs [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Accrual for environmental loss contingencies, period increase (decrease) |  |  |  |  |  |  |  | 10,100 |
Johnny M Mine Area near San Mateo, New Mexico [Member] | Environmental Remediation Past Response Costs [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Accrual for environmental loss contingencies, period increase (decrease) |  |  |  |  |  |  |  | $ 1,100 |
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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