Note 6 - Allowance for Credit Losses and Credit Quality Information - Allowance for Loan Losses (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023		Dec. 31, 2022	Jan. 01, 2023
Balance		$ 10,277	[1]	$ 9,279
Provision for losses	[2]	795		1,071
Charge-offs		(384)		(115)
Recoveries		66		42
Balance	[1]	11,824		10,277
Individual reserves		428		162
Collective reserves		11,396		10,115
Allowance for credit losses (2)	[1]	11,824		10,277
Individually reviewed for impairment		4,284		2,140
Collectively reviewed for impairment		853,824		785,747
Ending balance		858,108		787,887
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance		1,070
Balance				1,070
Allowance for credit losses (2)				1,070	$ 1,100
Residential Portfolio Segment [Member]
Balance		1,261		974
Provision for losses		403		286
Charge-offs		0		0
Recoveries		21		1
Balance		1,426		1,261
Individual reserves		28		33
Collective reserves		1,398		1,228
Allowance for credit losses (2)		1,426		1,261
Individually reviewed for impairment		979		908
Collectively reviewed for impairment		263,324		204,982
Ending balance		264,303		205,890
Residential Portfolio Segment [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance		(259)
Balance				(259)
Allowance for credit losses (2)				(259)
Commercial Real Estate Portfolio Segment [Member]
Balance		7,026		6,388
Provision for losses		(24)		729
Charge-offs		0		(91)
Recoveries		0		0
Balance		7,514		7,026
Individual reserves		0		0
Collective reserves		7,514		7,026
Allowance for credit losses (2)		7,514		7,026
Individually reviewed for impairment		668		179
Collectively reviewed for impairment		489,285		471,166
Ending balance		489,953		471,345
Commercial Real Estate Portfolio Segment [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance		512
Balance				512
Allowance for credit losses (2)				512
Consumer Portfolio Segment [Member]
Balance		1,058		981
Provision for losses		77		94
Charge-offs		(50)		(24)
Recoveries		7		7
Balance		607		1,058
Individual reserves		103		112
Collective reserves		504		946
Allowance for credit losses (2)		607		1,058
Individually reviewed for impairment		425		492
Collectively reviewed for impairment		42,309		44,325
Ending balance		42,734		44,817
Consumer Portfolio Segment [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance		(485)
Balance				(485)
Allowance for credit losses (2)				(485)
Commercial Portfolio Segment [Member]
Balance		932		936
Provision for losses		339		(38)
Charge-offs		(334)		0
Recoveries		38		34
Balance		2,277		932
Individual reserves		297		17
Collective reserves		1,980		915
Allowance for credit losses (2)		2,277		932
Individually reviewed for impairment		2,212		561
Collectively reviewed for impairment		58,906		65,274
Ending balance		61,118		65,835
Commercial Portfolio Segment [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance		$ 1,302
Balance				1,302
Allowance for credit losses (2)				$ 1,302

[1] The Company adopted Accounting Standards Update 2016-13 as of January 1, 2023. The 2022 amounts presented are calculated under the prior accounting standard.

[2] The Company adopted ASU 2016-13 as of January 1, 2023. The 2022 amounts presented are calculated under the prior accounting standard.