Note 3 - Investment Securities - Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Due within one year, AFS, amortized cost	$ 726	$ 1,669
Due within one year, AFS, fair value	726	1,691
Due within one year, HTM, amortized cost	870	830
Due within one year, HTM, fair value	902	832
Due after one year through five years, AFS, amortized cost	14,189	12,937
Due after one year through five years, AFS, fair value	14,327	13,014
Due after one year through five years, HTM, amortized cost	1,875	2,745
Due after one year through five years, HTM, fair value	2,018	2,751
Due after five years through ten years, AFS, amortized cost	51,988	64,159
Due after five years through ten years, AFS, fair value	52,376	64,865
Due after five years through ten years, HTM, amortized cost	4,165	4,650
Due after five years through ten years, HTM, fair value	4,356	4,654
Due after ten years, AFS, amortized cost	289,736	185,148
Due after ten years, AFS, fair value	288,080	188,840
Due after ten years, HTM, amortized cost	3,345	4,209
Due after ten years, HTM, fair value	3,451	4,412
Total debt securities, AFS, amortized cost	356,639	263,913
Total debt securities, AFS, fair value	355,509	268,410
Total debt securities, HTM, amortized cost	10,255	12,434
Total debt securities, HTM, fair value	$ 10,727	$ 12,649