Note 7 - Securities Available for Sale - Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Due less than one year, amortized cost	$ 90,555
Due less than one year, fair value	84,341
Due after one year through five years, amortized cost	123,537
Due after one year through five years, fair value	110,836
Due after five years through fifteen years, amortized cost	39,283
Due after five years through fifteen years, fair value	34,850
Total, amortized cost	253,375	$ 272,319
Total, fair value	$ 230,027	$ 246,019