Note 3 - Investment Securities - Contractual Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Due within one year, AFS, amortized cost	$ 3,673	$ 1,082
Due within one year, AFS, fair value	3,611	1,072
Due within one year, HTM, amortized cost	915	915
Due within one year, HTM, fair value	916	915
Due after one year through five years, AFS, amortized cost	34,748	32,452
Due after one year through five years, AFS, fair value	33,302	31,394
Due after one year through five years, HTM, amortized cost	960	960
Due after one year through five years, HTM, fair value	961	961
Due after five years through ten years, AFS, amortized cost	48,078	52,093
Due after five years through ten years, AFS, fair value	43,808	48,229
Due after five years through ten years, HTM, amortized cost	3,407	3,663
Due after five years through ten years, HTM, fair value	3,345	3,536
Due after ten years, AFS, amortized cost	365,554	381,689
Due after ten years, AFS, fair value	308,862	324,472
Due after ten years, HTM, amortized cost	12,530	2,767
Due after ten years, HTM, fair value	12,691	2,510
Total debt securities, AFS, amortized cost	452,053	467,316
Total debt securities, AFS, fair value	389,583	405,167
Total debt securities, HTM, amortized cost	17,812	8,305
Total debt securities, HTM, fair value	$ 17,913	$ 7,922