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Note 10 - Commitments, Contingencies and Obligations (Details Textual) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | ---
Jul. 12, 2022 | Jun. 30, 2022 | Jul. 31, 2018 | Aug. 31, 2012 | Jun. 30, 2011 | Sep. 30, 2022 | Sep. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Environmental Remediation Expense |  |  |  |  |  | $ 1,781,000 | $ 7,564,000 |  | $ 4,154,000 | $ 12,297,000
Finance Lease, Liability, to be Paid, Total |  |  |  |  |  | 22,298,000 |  |  | 22,298,000 |
Lessee, Operating Lease, Liability, to be Paid, Total |  |  |  |  |  | 13,648,000 |  |  | 13,648,000 |
Lease Commitments [Member] |  |  |  |  |  |  |  |  |  |
Finance Lease, Liability, to be Paid, Total |  |  |  |  |  | 22,300,000 |  |  | 22,300,000 |
Lessee, Operating Lease, Liability, to be Paid, Total |  |  |  |  |  | 13,600,000 |  |  | 13,600,000 |
Performance Obligation Commitments [Member] |  |  |  |  |  |  |  |  |  |
Surety Bonds |  |  |  |  |  | 193,800,000 |  |  | 193,800,000 |
Letters of Credit Outstanding, Amount |  |  |  |  |  | 7,800,000 |  |  | 7,800,000 |
Greens Creek [Member] |  |  |  |  |  |  |  |  |  |
EPA Maximum for Statutory Penalties, Per Day/Violation |  | $ 81,540,000 |  |  |  |  |  |  |  |
EPA Maximum for Administrative Penalties, Per Day/Violation |  | $ 47,423,000 |  |  |  |  |  |  |  |
Greens Creek [Member] | Purchase Orders and Commitment [Member] |  |  |  |  |  |  |  |  |  |
Contractual Obligation, Total |  |  |  |  |  | 9,000,000 |  |  | 9,000,000 |
Lucky Friday [Member] |  |  |  |  |  |  |  |  |  |
EPA Maximum for Statutory Penalties, Per Day/Violation | $ 59,973,000 |  |  |  |  |  |  |  |  |
EPA Maximum for Administrative Penalties, Per Day/Violation | 23,989,000 |  |  |  |  |  |  |  |  |
EPA Maximum for Administrative Penalties, Total | $ 299,989,000 |  |  |  |  |  |  |  |  |
Lucky Friday [Member] | Purchase Orders and Commitment [Member] |  |  |  |  |  |  |  |  |  |
Contractual Obligation, Total |  |  |  |  |  | 20,400,000 |  |  | 20,400,000 |
Casa Berardi [Member] | Purchase Orders and Commitment [Member] |  |  |  |  |  |  |  |  |  |
Contractual Obligation, Total |  |  |  |  |  | 1,200,000 |  |  | 1,200,000 |
Nevada Operations [Member] | Purchase Orders and Commitment [Member] |  |  |  |  |  |  |  |  |  |
Contractual Obligation, Total |  |  |  |  |  | 2,600,000 |  |  | 2,600,000 |
Keno Hill [Member] | Purchase Orders and Commitment [Member] |  |  |  |  |  |  |  |  |  |
Contractual Obligation, Total |  |  |  |  |  | $ 300,000 |  |  | $ 300,000 |
Johnny M Mine Area near San Mateo, New Mexico [Member] |  |  |  |  |  |  |  |  |  |
Payment Of Response Costs |  |  |  | $ 1,100,000 |  |  |  |  |  |
Estimated Response Costs |  |  | $ 9,600,000 |  |  |  |  | $ 9,000,000 |  |
Environmental Remediation Expense |  |  |  |  |  |  |  | 9,000,000 |  |
Johnny M Mine Area near San Mateo, New Mexico [Member] | Environmental Remediation, Past Response Costs [Member] |  |  |  |  |  |  |  |  |  |
Accrual for Environmental Loss Contingencies, Period Increase (Decrease), Total |  |  |  |  |  |  |  | $ 2,900,000 |  |
Carpenter Snow Creek Superfund Site, Cascade County, Montana [Member] |  |  |  |  |  |  |  |  |  |
Estimated Response Costs |  |  |  |  | $ 4,500,000 |  |  |  |  |
Estimated Future Response Cost |  |  |  |  | $ 100,000,000 |  |  |  |  |

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