Note 4 - 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		3 Months Ended		12 Months Ended
		Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022		Jan. 01, 2023
Balance,		$ 19,555	$ 18,678	$ 18,678
Provision for (recovery of) credit losses		329	(758)	1,597
Charge-offs		(395)	(37)	(1,019)
Recoveries		180	105	299
Balance		24,861	17,988	19,555
Provision for (recovery of) unfunded commitments		329	(758)	1,597
Financing Receivable, Credit Loss, Expense (Reversal)		329	(758)	1,597
Individually evaluated for impairment				0
Collectively evaluated for impairment				19,462
Total		24,861	17,988	19,555
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
Total				5,192		$ 5,200
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Total						205
Unfunded Loan Commitment [Member]
Balance,		377	386	386
Provision for (recovery of) credit losses		6	26	(9)
Balance		688	412	377
Provision for (recovery of) unfunded commitments		6	26	(9)
Financing Receivable, Credit Loss, Expense (Reversal)		6	26	(9)
Total		688	412	377
Unfunded Loan Commitment [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance,		305	0	0
Balance				305
Total				305
Commercial Portfolio Segment [Member]
Balance,	[1]	2,874	2,668	2,668
Provision for (recovery of) credit losses		245		442	[1]
Charge-offs	[1]	(360)		(357)
Recoveries	[1]	34		121
Balance	[1]	3,676		2,874
Provision for (recovery of) unfunded commitments		245		442	[1]
Financing Receivable, Credit Loss, Expense (Reversal)		245		442	[1]
Individually evaluated for impairment	[1]			0
Collectively evaluated for impairment	[1]			2,873
Total	[1]	3,676		2,874
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
Commercial Portfolio Segment [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Total						0
Construction and Land Development [Member]
Balance,		1,796	1,397	1,397
Provision for (recovery of) credit losses		212		399
Charge-offs		0		0
Recoveries		0		0
Balance		2,280		1,796
Provision for (recovery of) unfunded commitments		212		399
Financing Receivable, Credit Loss, Expense (Reversal)		212		399
Individually evaluated for impairment				0
Collectively evaluated for impairment				1,772
Total		2,280		1,796
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	3,964
Provision for (recovery of) credit losses		(28)		(199)
Charge-offs		0		0
Recoveries		6		20
Balance		4,841		3,785
Provision for (recovery of) unfunded commitments		(28)		(199)
Financing Receivable, Credit Loss, Expense (Reversal)		(28)		(199)
Individually evaluated for impairment				0
Collectively evaluated for impairment				3,762
Total		4,841		3,785
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] | Owner Occupied Commercial Real Estate [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Total						110
Commercial Real Estate Portfolio Segment [Member] | Non-owner Occupied Commercial Real Estate [Member]
Balance,		7,184	7,141	7,141
Provision for (recovery of) credit losses		(21)		476
Charge-offs		0		(436)
Recoveries		24		3
Balance		9,256		7,184
Provision for (recovery of) unfunded commitments		(21)		476
Financing Receivable, Credit Loss, Expense (Reversal)		(21)		476
Individually evaluated for impairment				0
Collectively evaluated for impairment				7,184
Total		9,256		7,184
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
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] | Financial Asset Acquired with Credit Deterioration [Member]
Total						30
Residential Portfolio Segment [Member]
Balance,		3,867	3,458	3,458
Provision for (recovery of) credit losses				373
Charge-offs				(5)
Recoveries				41
Balance				3,867
Provision for (recovery of) unfunded commitments				373
Financing Receivable, Credit Loss, Expense (Reversal)				373
Individually evaluated for impairment				0
Collectively evaluated for impairment				3,822
Total				3,867
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		(38)
Charge-offs		0
Recoveries		62
Balance		3,754		3,077
Provision for (recovery of) unfunded commitments		(38)
Financing Receivable, Credit Loss, Expense (Reversal)		(38)
Total		3,754		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] | Residential [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Total						41
Residential Portfolio Segment [Member] | Home Equity Line of Credit [Member]
Balance,		790
Provision for (recovery of) credit losses		(24)
Charge-offs		0
Recoveries		8
Balance		964		790
Provision for (recovery of) unfunded commitments		(24)
Financing Receivable, Credit Loss, Expense (Reversal)		(24)
Total		964		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
Residential Portfolio Segment [Member] | Home Equity Line of Credit [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Total						3
Consumer Portfolio Segment [Member]
Balance,		49	$ 50	50
Provision for (recovery of) credit losses		(17)		106
Charge-offs		(35)		(221)
Recoveries		46		114
Balance		90		49
Provision for (recovery of) unfunded commitments		(17)		106
Financing Receivable, Credit Loss, Expense (Reversal)		(17)		106
Individually evaluated for impairment				0
Collectively evaluated for impairment				49
Total		90		49
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
Consumer Portfolio Segment [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Total						$ 7

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