Note 15 - Retirement, Savings and Deferred Compensation Plans - Components of SERP Expense (Details) - Supplemental Employee Retirement Plan [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Service Cost	$ 369	$ 503
Interest Cost	886	636
Net amortization	71	312
Net periodic benefit cost	$ 1,326	$ 1,451