Note 9 - Employee Retirement Plans - Amounts Recognized In Other Comprehensive Income Loss (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Total net gain recognized in other comprehensive (income) loss	$ (6,404)	$ (3,472)	$ (568)

Amount, before tax, after reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan.

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