Note 14 - Retirement, Savings and Deferred Compensation Plans - Components of SERP Expense (Details) - Supplemental Employee Retirement Plan [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Service Cost	$ 503	$ 677
Interest Cost	636	540
Net amortization	312	509
Net periodic benefit cost	$ 1,451	$ 1,726