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Note 11 - Commitments, Contingencies and Obligations (Details Textual) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
May 31, 2024 | Jul. 31, 2018 | Jun. 30, 2011 | Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Environmental remediation expense |  |  |  | $ 844 | $ 1,153 | $ 1,634 | $ 2,139
Lessee, operating lease, liability, to be paid |  |  |  | 12,031 |  | 12,031 |
Lease Commitments [Member] |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Lessee, operating lease, liability, to be paid |  |  |  | 12,000 |  | 12,000 |
Performance Obligation Commitments [Member] |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Surety bonds |  |  |  | 218,900 |  | 218,900 |
Letters of credit outstanding, amount |  |  |  | 6,700 |  | 6,700 |
Notice Of Assessment [Member] | Canada Revenue Agency [Member] |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Assessed sales tax | $ 1,973,181 |  |  |  |  |  |
Greens Creek [Member] |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Contractual obligation |  |  |  | 19,700 |  | 19,700 |
Greens Creek [Member] | Purchase Orders and Commitment [Member] |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Contractual obligation |  |  |  | 12,300 |  | 12,300 |
Lucky Friday [Member] | Purchase Orders and Commitment [Member] |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Contractual obligation |  |  |  | 5,900 |  | 5,900 |
Keno Hill [Member] | Purchase Orders and Commitment [Member] |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Contractual obligation |  |  |  | 8,400 |  | 8,400 |
Casa Berardi [Member] | Purchase Orders and Commitment [Member] |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Contractual obligation |  |  |  | 10,400 |  | 10,400 |
Other [Member] | Purchase Orders and Commitment [Member] |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Contractual obligation |  |  |  | $ 4,500 |  | $ 4,500 |
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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