Note 5 - Defined Benefit Plan - Defined Benefit Plan Activity (Details) - Net Periodic Benefit Cost [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Service cost	$ 248	$ 261
Interest cost	324	302
Expected return on plan assets	(692)	(608)
Recognized net actuarial loss	0	33
Net periodic benefit income	$ (120)	$ (12)