Note 10 - Benefit Plans - Net Periodic Benefit Cost (Details) - Supplemental Employee Retirement Plan [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Service cost on benefits earned during the period	$ 21	$ 203
Interest cost on projected benefit obligation	637	401
Recognized actuarial loss	218	1,715
Net periodic pension cost after settlements	$ 876	$ 2,319