Note 15 - Retirement Fund and Profit Sharing Plan - Changes in Plan Assets and Benefit Obligation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Actuarial loss (gain)	$ 828	$ (5,938)
Supplemental Employee Retirement Plan [Member]
Company contributions	775	606
Benefits paid	(775)	(606)
Benefit obligation	18,175	23,580
Service Cost	369	503
Interest Cost	886	636
Benefits paid	(775)	(606)
Benefit obligation	19,484	18,175
Underfunded status, December 31	$ (19,484)	$ (18,175)