Note 20 - Fair Value Measurements and Fair Value of Financial Instruments - Assets Measured on Recurring Basis Using Significant Unobservable Inputs (Details) - US States and Political Subdivisions Debt Securities [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Beginning balance, January 1, 2022	$ 8,565	$ 8,844
Principal paydowns	(287)	(279)
Changes in unrealized gain (loss)	(929)
Ending balance, December 31, 2022	$ 7,349	$ 8,565