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Note 4 - Allowance for Credit Losses - Allowance by Impairment Methodology and Loans by Impairment Methodology (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Beginning Balance, December 31, 2022	$ 7,446	$ 5,710	$ 5,710
Charge-offs	(977)	(106)	(529)
Recoveries	62	224	415
Provision for (recovery of) credit losses	0	0	1,850
Ending Balance, March 31, 2023	8,717	5,828	7,446
Individually evaluated	0	0	888
Collectively evaluated	8,717	5,828	6,558
Loans	917,967	836,423	920,523
Individually evaluated	1,591	2,130	2,673
Collectively evaluated	916,376	834,293	917,850
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Beginning Balance, December 31, 2022	2,186
Ending Balance, March 31, 2023			2,186
Real Estate 1 [Member] | Construction and Land Development [Member]
Beginning Balance, December 31, 2022	546	345	345
Charge-offs	0	0	0
Recoveries	0	4	10
Provision for (recovery of) credit losses	11	(1)	191
Ending Balance, March 31, 2023	244	348	546
Individually evaluated	0	0	0
Collectively evaluated	244	348	546
Loans	48,610	49,308	51,840
Individually evaluated	1,044	0	1,045
Collectively evaluated	47,566	49,308	50,795
Real Estate 1 [Member] | Construction and Land Development [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Beginning Balance, December 31, 2022	(313)
Ending Balance, March 31, 2023			(313)
Real Estate 1 [Member] | Secured by Multi-family Residential Properties [Member]
Beginning Balance, December 31, 2022	1,108	1,077	1,077
Charge-offs	0	0	(6)
Recoveries	5	5	19
Provision for (recovery of) credit losses	74	(113)	18
Ending Balance, March 31, 2023	2,596	969	1,108
Individually evaluated	0	0	0
Collectively evaluated	2,596	969	1,108
Loans	334,302	290,408	331,421
Individually evaluated	474	619	530
Collectively evaluated	333,828	289,789	330,891
Real Estate 1 [Member] | Secured by Multi-family Residential Properties [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Beginning Balance, December 31, 2022	1,409
Ending Balance, March 31, 2023			1,409
Real Estate 1 [Member] | Other Real Estate Loans [Member]
Beginning Balance, December 31, 2022	3,609	3,230	3,230
Charge-offs	0	0	0
Recoveries	2	2	15
Provision for (recovery of) credit losses	(150)	145	364
Ending Balance, March 31, 2023	5,166	3,377	3,609
Individually evaluated	0	0	0
Collectively evaluated	5,166	3,377	3,609
Loans	416,001	384,191	418,456
Individually evaluated	73	28	13
Collectively evaluated	415,928	384,163	418,443
Real Estate 1 [Member] | Other Real Estate Loans [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Beginning Balance, December 31, 2022	1,705
Ending Balance, March 31, 2023			1,705
Commercial and Industrial Loans [Member]
Beginning Balance, December 31, 2022	1,874	718	718
Charge-offs	(851)	(8)	(32)
Recoveries	0	140	145
Provision for (recovery of) credit losses	(15)	(40)	1,043
Ending Balance, March 31, 2023	617	810	1,874
Individually evaluated	0	0	888
Collectively evaluated	617	810	986
Loans	110,937	103,682	111,225
Individually evaluated	0	1,483	1,085
Collectively evaluated	110,937	102,199	110,140
Commercial and Industrial Loans [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Beginning Balance, December 31, 2022	(391)
Ending Balance, March 31, 2023			(391)
Consumer and Other Loans [Member]
Beginning Balance, December 31, 2022	309	340	340
Charge-offs	(126)	(98)	(491)
Recoveries	55	73	226
Provision for (recovery of) credit losses	80	9	234
Ending Balance, March 31, 2023	94	324	309
Individually evaluated	0	0	0
Collectively evaluated	94	324	309
Loans	8,117	8,834	7,581
Individually evaluated	0	0	0
Collectively evaluated	8,117	$ 8,834	7,581
Consumer and Other Loans [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Beginning Balance, December 31, 2022	$ (224)
Ending Balance, March 31, 2023			$ (224)

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- Definition

Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

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Amount of credit loss expense (reversal of expense) for financing receivable.

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