Note 2 - Loans and Allowance for Credit Losses - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Balance	$ 8,225	$ 7,674	$ 7,674
Charge-offs	(92)	(60)	(367)
Recoveries	173	40	212
Provision for credit losses	2	134	706
Balance	10,650	7,788	8,225
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Balance	2,342
Balance			2,342
Real Estate Construction Portfolio Segment[Member]
Balance	450	422	422
Provision for credit losses	22	171	28
Balance	451	593	450
Real Estate Construction Portfolio Segment[Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Balance	(21)
Balance			(21)
Consumer Real Estate Portfolio Segment [Member]
Balance	2,199	1,930	1,930
Charge-offs	0	0	(13)
Recoveries	102	0	29
Provision for credit losses	(260)	5	253
Balance	3,302	1,935	2,199
Consumer Real Estate Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Balance	1,261
Balance			1,261
Commercial Real Estate Portfolio Segment [Member]
Balance	3,642	3,121	3,121
Recoveries	12	12	49
Provision for credit losses	20	290	472
Balance	4,374	3,423	3,642
Commercial Real Estate Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Balance	700
Balance			700
Commercial Non Real Estate Segment [Member]
Balance	930	1,099	1,099
Charge-offs	(12)	0	(2)
Recoveries	2	3	11
Provision for credit losses	58	(158)	(178)
Balance	1,194	944	930
Commercial Non Real Estate Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Balance	216
Balance			216
Public Sector and IDA Portfolio Segment[Member]
Balance	319	297	297
Provision for credit losses	(10)	10	22
Balance	294	307	319
Public Sector and IDA Portfolio Segment[Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Balance	(15)
Balance			(15)
Consumer Non Real Estate Portfolio Segment [Member]
Balance	506	444	444
Charge-offs	(80)	(60)	(352)
Recoveries	57	25	123
Provision for credit losses	0	6	291
Balance	555	415	506
Consumer Non Real Estate Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Balance	72
Balance			72
Unallocated Financing Receivables [Member]
Balance	179	361	361
Provision for credit losses	172	(190)	(182)
Balance	480	$ 171	179
Unallocated Financing Receivables [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Balance	$ 129
Balance			$ 129