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Note 10 - Commitments, Contingencies and Obligations (Details Textual) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | ---
Jul. 12, 2022 | Jun. 30, 2022 | Jul. 31, 2018 | Aug. 31, 2012 | Jun. 30, 2011 | Jun. 30, 2022 | Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Environmental Remediation Expense |  |  |  |  |  | $ 1,472,000 | $ 1,024,000 |  | $ 2,373,000 | $ 4,733,000
Finance Lease, Liability, to be Paid, Total |  | $ 15,927,000 |  |  |  | 15,927,000 |  |  | 15,927,000 |
Lessee, Operating Lease, Liability, to be Paid, Total |  | 14,236,000 |  |  |  | 14,236,000 |  |  | 14,236,000 |
Lease Commitments [Member] |  |  |  |  |  |  |  |  |  |
Finance Lease, Liability, to be Paid, Total |  | 15,900,000 |  |  |  | 15,900,000 |  |  | 15,900,000 |
Lessee, Operating Lease, Liability, to be Paid, Total |  | 14,200,000 |  |  |  | 14,200,000 |  |  | 14,200,000 |
Performance Obligation Commitments [Member] |  |  |  |  |  |  |  |  |  |
Surety Bonds |  | 181,800,000 |  |  |  | 181,800,000 |  |  | 181,800,000 |
Letters of Credit Outstanding, Amount |  | 14,900,000 |  |  |  | 14,900,000 |  |  | 14,900,000 |
Greens Creek [Member] |  |  |  |  |  |  |  |  |  |
EPA Maximum for Statutory Penalties, Per Day/Violation |  | 81,540 |  |  |  |  |  |  |  |
EPA Maximum for Administrative Penalties, Per Day/Violation |  | 47,423 |  |  |  |  |  |  |  |
Greens Creek [Member] | Purchase Orders and Commitment [Member] |  |  |  |  |  |  |  |  |  |
Contractual Obligation, Total |  | 8,100,000 |  |  |  | 8,100,000 |  |  | 8,100,000 |
Lucky Friday [Member] | Purchase Orders and Commitment [Member] |  |  |  |  |  |  |  |  |  |
Contractual Obligation, Total |  | 19,100,000 |  |  |  | 19,100,000 |  |  | 19,100,000 |
Lucky Friday [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
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, Total | $ 299,989 |  |  |  |  |  |  |  |  |
Casa Berardi [Member] | Purchase Orders and Commitment [Member] |  |  |  |  |  |  |  |  |  |
Contractual Obligation, Total |  | 1,300,000 |  |  |  | 1,300,000 |  |  | 1,300,000 |
Nevada Operations [Member] | Purchase Orders and Commitment [Member] |  |  |  |  |  |  |  |  |  |
Contractual Obligation, Total |  | $ 3,400,000 |  |  |  | $ 3,400,000 |  |  | $ 3,400,000 |
Johnny M Mine Area near San Mateo, New Mexico [Member] |  |  |  |  |  |  |  |  |  |
Payment Of Response Costs |  |  |  | $ 1,100,000 |  |  |  |  |  |
Estimated Response Costs |  |  | $ 9,600,000 |  |  |  |  | $ 9,000,000.0 |  |
Environmental Remediation Expense |  |  |  |  |  |  |  | 9,000,000.0 |  |
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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