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Note 9 - Employee Retirement Plans - Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Projected and accumulated benefit obligation	$ 50,097	$ 64,273	$ 84,308	$ 88,960
Fair value of plan assets	$ 30,843	$ 45,378	$ 56,779	$ 56,495

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.

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