Note 7 - Securities Available for Sale - Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Due less than one year, amortized cost	$ 78,761
Due less than one year, fair value	73,186
Due after one year through five years, amortized cost	136,725
Due after one year through five years, fair value	123,983
Due after five years through fifteen years, amortized cost	47,658
Due after five years through fifteen years, fair value	42,521
Due after fifteen years, amortized cost	4
Due after fifteen years, fair value	3
Total, amortized cost	263,148	$ 272,319
Total, fair value	$ 239,693	$ 246,019