Note 5 - Allowance for Credit Losses - Loans and Reserve for Unfunded Lending Commitments - Changes in Allowance for Loan Losses and Reserve for Unfunded Lending Commitments (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Jan. 01, 2023
Balance,		$ 19,555	$ 18,678	$ 21,403
Provision for (recovery of) credit losses		433	1,597	(2,825)
Current period gross write-offs, total		(1,002)	(1,019)	(146)
Recoveries		1,095	299	246
Balance,		25,273	19,555	18,678
Individually evaluated for impairment			0
Collectively evaluated for impairment			19,462
Total		25,273	19,555	18,678
Individually evaluated for impairment			5,094
Collectively evaluated for impairment			2,167,814
Total			2,186,449
Financial Asset Acquired with Credit Deterioration [Member]
Individually evaluated for impairment			93
Individually evaluated for impairment			13,541
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance,		5,192	0	0
Balance,			5,192	0
Total			5,192	0	$ 5,200
Loans Discluding Unfunded Commitments [Member]
Balance,		19,555
Provision for (recovery of) credit losses		433
Current period gross write-offs, total		(1,002)
Recoveries		1,095
Balance,		25,273	19,555
Total		25,273	19,555
Loans Discluding Unfunded Commitments [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance,		5,192
Balance,			5,192
Total			5,192
Unfunded Loan Commitment [Member]
Balance,		377	386	304
Provision for (recovery of) credit losses		63	(9)	82
Balance,		745	377	386
Total		745	377	386
Unfunded Loan Commitment [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance,		305	0	0
Balance,			305	0
Total			305	0
Commercial Portfolio Segment [Member]
Balance,	[1]	2,874	2,668
Provision for (recovery of) credit losses		390	442
Current period gross write-offs, total	[1]	(894)	(357)
Recoveries	[1]	492	121
Balance,	[1]	3,745	2,874	2,668
Individually evaluated for impairment	[1]		0
Collectively evaluated for impairment	[1]		2,873
Total	[1]	3,745	2,874	2,668
Individually evaluated for impairment	[1]		0
Collectively evaluated for impairment	[1]		304,240
Total	[1]		304,247
Commercial Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Individually evaluated for impairment	[1]		1
Individually evaluated for impairment	[1]		7
Commercial Portfolio Segment [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance,		883
Balance,			883
Total			883
Construction and Land Development [Member]
Balance,		1,796	1,397
Provision for (recovery of) credit losses		769	399
Current period gross write-offs, total		0	0
Recoveries		10	0
Balance,		2,847	1,796	1,397
Individually evaluated for impairment			0
Collectively evaluated for impairment			1,772
Total		2,847	1,796	1,397
Individually evaluated for impairment			0
Collectively evaluated for impairment			196,357
Total			197,525
Construction and Land Development [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Individually evaluated for impairment			24
Individually evaluated for impairment			1,168
Construction and Land Development [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance,		272
Balance,			272
Total			272
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Commercial Real Estate [Member]
Balance,		3,785	3,964
Provision for (recovery of) credit losses		(317)	(199)
Current period gross write-offs, total		0	0
Recoveries		37	20
Balance,		4,583	3,785	3,964
Individually evaluated for impairment			0
Collectively evaluated for impairment			3,762
Total		4,583	3,785	3,964
Individually evaluated for impairment			2,420
Collectively evaluated for impairment			408,656
Total			418,462
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Commercial Real Estate [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Individually evaluated for impairment			23
Individually evaluated for impairment			7,386
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Commercial Real Estate [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance,		1,078
Balance,			1,078
Total			1,078
Commercial Real Estate Portfolio Segment [Member] | Non-owner Occupied Commercial Real Estate [Member]
Balance,		7,184	7,141
Provision for (recovery of) credit losses		(355)	476
Current period gross write-offs, total		0	(436)
Recoveries		213	3
Balance,		9,111	7,184	7,141
Individually evaluated for impairment			0
Collectively evaluated for impairment			7,184
Total		9,111	7,184	7,141
Individually evaluated for impairment			1,360
Collectively evaluated for impairment			824,153
Total			827,728
Commercial Real Estate Portfolio Segment [Member] | Non-owner Occupied Commercial Real Estate [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Individually evaluated for impairment			0
Individually evaluated for impairment			2,215
Commercial Real Estate Portfolio Segment [Member] | Non-owner Occupied Commercial Real Estate [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance,		2,069
Balance,			2,069
Total			2,069
Residential Portfolio Segment [Member]
Balance,		3,867	3,458
Provision for (recovery of) credit losses			373
Current period gross write-offs, total			(5)
Recoveries			41
Balance,			3,867	3,458
Individually evaluated for impairment			0
Collectively evaluated for impairment			3,822
Total			3,867	3,458
Individually evaluated for impairment			1,314
Collectively evaluated for impairment			427,809
Total			431,872
Residential Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Individually evaluated for impairment			45
Individually evaluated for impairment			2,749
Residential Portfolio Segment [Member] | Residential [Member]
Balance,		3,077
Provision for (recovery of) credit losses		40
Current period gross write-offs, total		(6)
Recoveries		164
Balance,		3,928	3,077
Total		3,928	3,077
Residential Portfolio Segment [Member] | Residential [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance,		653
Balance,			653
Total			653
Residential Portfolio Segment [Member] | Home Equity Line of Credit [Member]
Balance,		790
Provision for (recovery of) credit losses		(69)
Current period gross write-offs, total		(9)
Recoveries		57
Balance,		959	790
Total		959	790
Residential Portfolio Segment [Member] | Home Equity Line of Credit [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance,		190
Balance,			190
Total			190
Consumer Portfolio Segment [Member]
Balance,		49	50
Provision for (recovery of) credit losses		(25)	106
Current period gross write-offs, total		(93)	(221)
Recoveries		122	114
Balance,		100	49	50
Individually evaluated for impairment			0
Collectively evaluated for impairment			49
Total		100	49	$ 50
Individually evaluated for impairment			0
Collectively evaluated for impairment			6,599
Total			6,615
Consumer Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Individually evaluated for impairment			0
Individually evaluated for impairment			16
Consumer Portfolio Segment [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance,		$ 47
Balance,			47
Total			$ 47

[1] Includes PPP loans, which are guaranteed by the SBA and have no related allowance.