Note 5 - Allowance for Credit Losses on Loans and Nonperforming Assets - Allowance for Credit Losses on Unfunded Commitments (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023
Balance	$ 9,094	$ 8,225
Provision for (recovery of) credit losses	1,242	(1,278)
Balance	10,262	9,094
Cumulative Effect, Period of Adoption, Adjustment [Member] \| Accounting Standards Update 2016-13 [Member]
Balance		2,342
Unfunded Loan Commitment [Member]
Balance	259	35
Provision for (recovery of) credit losses	(15)	17
Balance	251	259
Unfunded Loan Commitment [Member] \| Cumulative Effect, Period of Adoption, Adjustment [Member] \| Accounting Standards Update 2016-13 [Member]
Balance	207
Balance		$ 207
Unfunded Loan Commitment [Member] \| Frontier Community Bank [Member]
FCB acquisition	$ 7

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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Name:	us-gaap_FinancingReceivableAllowanceForCreditLosses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant