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Note 11 - Commitments, Contingencies and Obligations (Details Textual) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jul. 31, 2018 | Jun. 30, 2011 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Loss Contingencies [Line Items] |  |  |  |  |  |
Environmental remediation expense |  |  | $ 1,268 | $ 1,542 | $ 2,902 | $ 3,681
Lessee, operating lease, liability, to be paid |  |  | 11,936 |  | 11,936 |
Lease Commitments [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Lessee, operating lease, liability, to be paid |  |  | 11,900 |  | 11,900 |
Performance Obligation Commitments [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Surety bonds |  |  | 218,800 |  | 218,800 |
Letters of credit outstanding, amount |  |  | 6,700 |  | 6,700 |
Greens Creek [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Contractual obligation |  |  | 17,200 |  | 17,200 |
Greens Creek [Member] | Purchase Orders and Commitment [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Contractual obligation |  |  | 10,700 |  | 10,700 |
Lucky Friday [Member] | Purchase Orders and Commitment [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Contractual obligation |  |  | 5,600 |  | 5,600 |
Keno Hill [Member] | Purchase Orders and Commitment [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Contractual obligation |  |  | 7,100 |  | 7,100 |
Casa Berardi [Member] | Purchase Orders and Commitment [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Contractual obligation |  |  | 8,000 |  | 8,000 |
Other [Member] | Purchase Orders and Commitment [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Contractual obligation |  |  | $ 5,000 |  | $ 5,000 |
Johnny M Mine Area near San Mateo, New Mexico [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Estimated response costs | $ 9,600 |  |  |  |  |
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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