Note 4 - Investment Securities - Summary of Amortized Cost and Fair Value by Contractual Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Due in one year or less	$ 0
Due in one year or less	0
Due after one year through five years	29,343
Due after one year through five years	27,161
Due after five years through ten years	73,165
Due after five years through ten years	64,035
Due after ten years	122,481
Due after ten years	102,431
Total held-to-maturity securities	224,989
Total held-to-maturity securities	193,627
Due in one year or less	1,999
Due in one year or less	1,935
Due after one year through five years	39,098
Due after one year through five years	34,881
Due after five years through ten years	16,537
Due after five years through ten years	13,982
Due after ten years	109,112
Due after ten years	96,458
MBS - GSE residential, amortized cost	213,934
MBS - GSE residential, fair value	180,250
Total available-for-sale debt securities	380,680
Total available-for-sale debt securities, fair value	$ 327,506	$ 344,040