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Note 4 - Employee Benefit Plans | 9 Months Ended
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Sep. 30, 2025
Disclosure Text Block [Abstract] |
Employee Benefit Plans | Note 4. Employee Benefit Plans We sponsor defined benefit pension plans covering all non-hourly U.S. employees hired prior to July 2024 and our hourly workers at the Lucky Friday mine, as well as a Supplemental Excess Retirement Plan covering certain eligible employees. Net periodic pension cost (benefit) for the plans consisted of the following for the three and nine months ended September 30, 2025 and 2024 (in thousands):
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Service cost |  | $ | 1,068 |  |  | $ | 914 |  |  | $ | 3,204 |  |  | $ | 2,744 |
Interest cost |  |  | 2,094 |  |  |  | 2,076 |  |  |  | 6,282 |  |  |  | 6,227 |
Expected return on plan assets |  |  | (3,251 | ) |  |  | (3,136 | ) |  |  | (9,753 | ) |  |  | (9,408 | )
Amortization of prior service cost |  |  | 20 |  |  |  | 67 |  |  |  | 60 |  |  |  | 199 |
Amortization of net loss |  |  | 326 |  |  |  | 15 |  |  |  | 978 |  |  |  | 46 |
Net periodic pension cost (benefit) |  | $ | 257 |  |  | $ | (64 | ) |  | $ | 771 |  |  | $ | (192 | )
For the three and nine months ended September 30, 2025 and 2024, the service cost component of net periodic pension benefit is included in the same line items of our condensed consolidated financial statements as other employee compensation costs. For the three and nine months ended September 30, 2025, the net benefit related to all other components of net periodic pension cost of $0.8 million (2024: $1.0 million) and $2.4 million (2024: $2.9 million), respectively, is included in other income on our condensed consolidated statements of operations and comprehensive income.

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