Note 7 - Employee Benefit Plans - Net Periodic Benefit Costs (Details) - Pension Plan And Supplemental Plan [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2023
Interest cost	$ 618	$ 630
Expected return on plan assets	(458)	(445)
Amortization of net actuarial gains	(55)	(30)
Net periodic pension cost	$ 105	$ 155