Note 5 - Employee Benefit Plans - Net Periodic Pension Cost (Details) - USD ($) $ in Thousands |
3 Months Ended | 12 Months Ended | |||
|---|---|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
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| Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract] | |||||
| Service cost | $ 999 | $ 1,068 | $ 4,270 | $ 3,659 | $ 3,794 |
| Interest cost | 2,181 | 2,094 | 8,377 | 8,302 | 7,974 |
| Expected return on plan assets | (2,969) | (3,251) | (10,187) | (12,544) | (12,428) |
| Amortization of prior service benefit | 20 | 20 | 82 | 265 | 500 |
| Amortization of net loss (gain) | 0 | 326 | 2,030 | 61 | (188) |
| Net periodic pension (benefit) cost | $ 231 | $ 257 | $ 4,572 | $ (257) | $ (348) |
| X | ||||||||||
- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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| X | ||||||||||
- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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| X | ||||||||||
- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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| X | ||||||||||
- Definition Amount of cost recognized for passage of time related to defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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| X | ||||||||||
- Definition Amount of net periodic benefit cost (credit) for defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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| X | ||||||||||
- References No definition available.
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