Note 6 - Employee Benefit Plans - Amounts Recognized in the Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Liabilities, Current [Abstract]
Accrued benefit asset	$ 19,879	$ 28,399
Accrued current benefit liability	(1,556)	(867)
Accrued benefit liability	(1,993)	0
Accumulated other comprehensive loss	19,489	8,031
Net amount recognized	$ 35,819	$ 35,563