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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Projected and accumulated benefit obligation $ 64,273 $ 84,308 $ 88,960 $ 91,654
Fair value of plan assets $ 45,378 $ 56,779 $ 56,495 $ 59,625