Note 4 - Securities Available for Sale - Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Due one year or less, amortized cost	$ 64,814
Due one year or less, fair value	60,590
Due after one year through five years, amortized cost	134,875
Due after one year through five years, fair value	124,096
Due after five years through fifteen years, amortized cost	33,786
Due after five years through fifteen years, fair value	30,405
Due after fifteen years, amortized cost	3
Due after fifteen years, fair value	3
Total, amortized cost	233,478	$ 272,319
Total, fair value	$ 215,094	$ 246,019