Note 5 - Employee Benefit Plans - Amounts Recognized in the Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Liabilities, Current [Abstract]
Accrued benefit asset	$ 27,806	$ 0
Accrued benefit liability	(790)	(1,315)
Accrued benefit liability	0	(4,673)
Accumulated other comprehensive loss	6,446	29,966
Net amount recognized	$ 33,462	$ 23,978