Note 5 - Loans and Leases - Change in Allowance (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Beginning balance	$ 18,806	$ 17,149	$ 17,149
Charge-offs	(226)	(303)
Recoveries	181	140
Provision for credit losses on loans	125	180
Ending balance	18,886	17,910	18,806
Initial allowance on loans purchased with credit deterioration		126
Cumulative Effect, Period of Adoption, Adjustment [Member]
Beginning balance		618	618
Commercial Portfolio Segment [Member]
Beginning balance	1,850	2,924	2,924
Charge-offs	(114)	(170)
Recoveries	2	20
Provision for credit losses on loans	166	(502)
Ending balance	1,904	2,550	1,850
Initial allowance on loans purchased with credit deterioration		0
Commercial Portfolio Segment [Member] \| Cumulative Effect, Period of Adoption, Adjustment [Member]
Beginning balance		278	278
Commercial Real Estate Portfolio Segment [Member]
Beginning balance	8,835	7,162	7,162
Charge-offs	(5)	(32)
Recoveries	155	39
Provision for credit losses on loans	(161)	106
Ending balance	8,824	8,157	8,835
Initial allowance on loans purchased with credit deterioration		126
Commercial Real Estate Portfolio Segment [Member] \| Cumulative Effect, Period of Adoption, Adjustment [Member]
Beginning balance		756	756
Consumer Portfolio Segment [Member]
Beginning balance	2,391	2,827	2,827
Charge-offs	(107)	(101)
Recoveries	22	72
Provision for credit losses on loans	(43)	197
Ending balance	2,263	2,448	2,391
Initial allowance on loans purchased with credit deterioration		0
Consumer Portfolio Segment [Member] \| Cumulative Effect, Period of Adoption, Adjustment [Member]
Beginning balance		(547)	(547)
Residential Portfolio Segment [Member]
Beginning balance	5,694	4,169	4,169
Charge-offs	0	0
Recoveries	2	9
Provision for credit losses on loans	150	307
Ending balance	5,846	4,683	5,694
Initial allowance on loans purchased with credit deterioration		0
Residential Portfolio Segment [Member] \| Cumulative Effect, Period of Adoption, Adjustment [Member]
Beginning balance		198	198
Unallocated Financing Receivables [Member]
Beginning balance	36	67	67
Charge-offs	0	0
Recoveries	0	0
Provision for credit losses on loans	13	72
Ending balance	$ 49	72	36
Initial allowance on loans purchased with credit deterioration		0
Unallocated Financing Receivables [Member] \| Cumulative Effect, Period of Adoption, Adjustment [Member]
Beginning balance		$ (67)	$ (67)

Amount of increase in allowance for credit loss on financing receivable purchased with credit deterioration.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
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-Publisher FASB
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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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