Note 6 - Employee Benefit Plans - Change in Benefit Obligation (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 |
|
| Defined Benefit Plan [Abstract] | |||||
| Benefit obligation at beginning of year | $ 168,190 | $ 168,004 | $ 168,004 | $ 149,426 | |
| Service cost | 999 | 1,068 | 4,270 | 3,659 | $ 3,794 |
| Interest cost | 2,181 | 2,094 | 8,377 | 8,302 | 7,974 |
| Change due to mortality change | 266 | 2,430 | |||
| Change due to discount rate change | (3,739) | 10,819 | |||
| Actuarial return | 249 | 1,714 | |||
| Benefits paid | (9,237) | (8,346) | |||
| Benefit obligation at end of year | 168,190 | 168,004 | 149,426 | ||
| Fair value of plan assets at beginning of year | $ 168,104 | $ 184,334 | 184,334 | 176,958 | |
| Actual return on plan assets | 31,372 | 15,722 | |||
| SERP assets to non-current investments | (39,641) | 0 | |||
| Benefits paid | (7,961) | (8,346) | |||
| Fair value of plan assets at end of year | 168,104 | 184,334 | $ 176,958 | ||
| Funded status at end of year | $ (86) | $ 16,330 | |||
| X | ||||||||||
- Definition Amount of increase (decrease) in benefit obligation of defined benefit plan from change in mortality rate. No definition available.
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| X | ||||||||||
- Definition Amount of increase (decrease) in benefit obligation of defined benefit plan from the change of the discount rate of the existing plan. No definition available.
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| X | ||||||||||
- Definition SERP assets to non-current investments No definition available.
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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| X | ||||||||||
- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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| X | ||||||||||
- Definition Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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 payment to participant under defined benefit plan which decreases plan assets. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. 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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