Note 6 - Employee Benefit Plans - Amounts Recognized in the Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Liabilities, Current [Abstract]
Accrued benefit asset	$ 28,399	$ 27,806
Accrued benefit liability	(867)	(790)
Accumulated other comprehensive loss	8,031	6,446
Net amount recognized	$ 35,563	$ 33,462

Amount of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans, classified as current.

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Reference 2: http://www.xbrl.org/2003/role/exampleRef
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