Note 7 - Securities Available for Sale - Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Due less than one year, amortized cost	$ 75,709
Due less than one year, fair value	69,735
Due after one year through five years, amortized cost	128,724
Due after one year through five years, fair value	114,251
Due after five years through fifteen years, amortized cost	39,395
Due after five years through fifteen years, fair value	34,179
Due after fifteen years, amortized cost	3
Due after fifteen years, fair value	2
Total, amortized cost	243,831	$ 272,319
Total, fair value	$ 218,167	$ 246,019