Note 5 - Defined Benefit Plan - Defined Benefit Plan Activity (Details) - Pension Plan [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Service cost	$ 261	$ 203	$ 522	$ 406
Interest cost	302	273	604	546
Expected return on plan assets	(608)	(518)	(1,216)	(1,036)
Amortization of prior service cost	0	0	0	0
Recognized net actuarial loss	33	17	66	34
Net periodic benefit income	$ (12)	$ (25)	$ (24)	$ (50)