Note 3 - Investments, Held to Maturity - Held to Maturity Maturity and Yields (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Due in one year or less, carrying value	$ 11,978
Due in one year or less, average book yield	2.94%
Due after one year through five years, carrying value	$ 13,858
Due after one year through five years, average book yield	3.60%
Due after five years through ten years, carrying value	$ 6,914
Due after five years through ten years, average book yield	6.90%
Due after ten years, carrying value	$ 21,272
Due after ten years, average book yield	7.07%
MBS, carrying value	$ 109,050
MBS, average book yield	4.66%
Total HTM Securities	$ 163,072	$ 167,438
Total HTM Securities	4.85%