Note 3 - Loans and Allowance for Credit Losses - Risk Category of Loans by Class (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Loans	$ 866,602	$ 958,488
Loans, write off	7,954	6,225	$ 3,248
Nonaccrual	403	146
Financial Asset, Not Past Due [Member]
Loans	857,250	949,456
Financial Asset, 30 to 59 Days Past Due [Member]
Loans	6,553	6,158
Financial Asset, 60 to 89 Days Past Due [Member]
Loans	2,008	2,100
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans	388	628
Commercial Portfolio Segment [Member]
Originated prior	20,566	23,903
Originated four years before	6,963	5,549
Originated three years before	12,601	12,557
Originated two years before	34,605	17,293
Originated one years before	22,146	53,928
Originated current year	13,112	23,966
Total Term Loans	109,993	137,196
Revolving Loans Amortized Cost Basis	26,557	32,421
Loans	136,550	169,617
Originated prior, writeoff	0
Originated four years before, writeoffs	0
Originated three years before, writeoffs	3
Originated two years before, writeoffs	135
Originated one years before, writeoffs	0
Originated current year, witeoffs	0
Total Term Loans, write off	138
Revolving Loans Amortized Cost Basis, write off	272
Loans, write off	410	20	56
Nonaccrual	71	50
Commercial Portfolio Segment [Member] \| Financial Asset, Not Past Due [Member]
Loans	136,421	169,337
Commercial Portfolio Segment [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Loans	58	172
Commercial Portfolio Segment [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Loans	0	58
Commercial Portfolio Segment [Member] \| Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans	0	0
Construction Portfolio Segment [Member]
Originated prior	0	0
Originated four years before	0	0
Originated three years before	0	0
Originated two years before	0	0
Originated one years before	0	0
Originated current year	0	0
Total Term Loans	0	0
Revolving Loans Amortized Cost Basis	5,063	3,088
Loans	5,063	3,088
Originated prior, writeoff	0
Originated four years before, writeoffs	0
Originated three years before, writeoffs	0
Originated two years before, writeoffs	0
Originated one years before, writeoffs	0
Originated current year, witeoffs	0
Total Term Loans, write off	0
Revolving Loans Amortized Cost Basis, write off	0
Loans, write off	0		(0)
Nonaccrual	0	0
Construction Portfolio Segment [Member] \| Financial Asset, Not Past Due [Member]
Loans	5,063	3,088
Construction Portfolio Segment [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Loans	0	0
Construction Portfolio Segment [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Loans	0	0
Construction Portfolio Segment [Member] \| Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans	0	0
Commercial Real Estate Portfolio Segment [Member]
Originated prior	182,981	154,671
Originated four years before	68,967	58,473
Originated three years before	70,110	73,552
Originated two years before	68,891	74,822
Originated one years before	50,899	71,618
Originated current year	45,675	57,971
Total Term Loans	487,523	491,107
Revolving Loans Amortized Cost Basis	0	0
Loans	487,523	491,107
Originated prior, writeoff	45
Originated four years before, writeoffs	0
Originated three years before, writeoffs	0
Originated two years before, writeoffs	0
Originated one years before, writeoffs	0
Originated current year, witeoffs	0
Total Term Loans, write off	45
Revolving Loans Amortized Cost Basis, write off	0
Loans, write off	45		(0)
Nonaccrual	330	53
Commercial Real Estate Portfolio Segment [Member] \| Financial Asset, Not Past Due [Member]
Loans	485,476	490,354
Commercial Real Estate Portfolio Segment [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Loans	951	508
Commercial Real Estate Portfolio Segment [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Loans	766	192
Commercial Real Estate Portfolio Segment [Member] \| Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans	0	0
Residential Portfolio Segment [Member]
Originated prior	9,935	13,834
Originated four years before	0	0
Originated three years before	0	0
Originated two years before	0	0
Originated one years before	0	0
Originated current year	0	0
Total Term Loans	9,935	13,834
Revolving Loans Amortized Cost Basis	0	0
Loans	9,935	13,834
Originated prior, writeoff	0
Originated four years before, writeoffs	0
Originated three years before, writeoffs	0
Originated two years before, writeoffs	0
Originated one years before, writeoffs	0
Originated current year, witeoffs	0
Total Term Loans, write off	0
Revolving Loans Amortized Cost Basis, write off	0
Loans, write off	0		(0)
Nonaccrual	2	27
Residential Portfolio Segment [Member] \| Financial Asset, Not Past Due [Member]
Loans	9,933	13,430
Residential Portfolio Segment [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Loans	0	377
Residential Portfolio Segment [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Loans	0	0
Residential Portfolio Segment [Member] \| Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans	0	0
Consumer Portfolio Segment [Member]
Originated prior	6,736
Originated four years before	12,480
Originated three years before	23,541
Originated two years before	53,953
Originated one years before	73,689
Originated current year	39,153
Revolving Loans Amortized Cost Basis	17,979
Loans	227,531	280,842
Originated prior, writeoff	246
Originated four years before, writeoffs	161
Originated three years before, writeoffs	843
Originated two years before, writeoffs	2,329
Originated one years before, writeoffs	3,191
Originated current year, witeoffs	453
Total Term Loans, write off	7,223
Revolving Loans Amortized Cost Basis, write off	276
Loans, write off	7,499	6,205	$ 3,192
Financing Receivable, Term Loan	209,552
Nonaccrual	0	16
Consumer Portfolio Segment [Member] \| Term Loan Originated Prior [Member]
Loans		6,179
Nonaccrual	0	0
Consumer Portfolio Segment [Member] \| Term Loans Originated in 2018 [Member]
Loans		13,500
Nonaccrual		0
Consumer Portfolio Segment [Member] \| Term Loans Originated in 2019 [Member]
Loans		22,985
Nonaccrual	0	0
Consumer Portfolio Segment [Member] \| Term Loans Originated in 2020 [Member]
Loans		37,133
Nonaccrual	0	0
Consumer Portfolio Segment [Member] \| Term Loans Originated in 2021 [Member]
Loans		78,754
Nonaccrual	0	0
Consumer Portfolio Segment [Member] \| Term Loans Originated in 2022 [Member]
Loans		101,764
Nonaccrual	0	0
Consumer Portfolio Segment [Member] \| Total Term Loans [Member]
Loans		260,315
Nonaccrual	0	0
Consumer Portfolio Segment [Member] \| Revolving Loans Amortized Cost Basis [Member]
Loans		20,527
Nonaccrual	0	16
Consumer Portfolio Segment [Member] \| Term Loans Originated in 2023 [Member]
Nonaccrual	0
Consumer Portfolio Segment [Member] \| Financial Asset, Not Past Due [Member]
Originated prior	6,545
Originated four years before	12,144
Originated three years before	22,700
Originated two years before	51,055
Originated one years before	71,388
Originated current year	38,699
Revolving Loans Amortized Cost Basis	17,826
Loans	220,357	273,247
Financing Receivable, Term Loan	202,531
Consumer Portfolio Segment [Member] \| Financial Asset, Not Past Due [Member] \| Term Loan Originated Prior [Member]
Loans		6,017
Consumer Portfolio Segment [Member] \| Financial Asset, Not Past Due [Member] \| Term Loans Originated in 2018 [Member]
Loans		13,147
Consumer Portfolio Segment [Member] \| Financial Asset, Not Past Due [Member] \| Term Loans Originated in 2019 [Member]
Loans		22,330
Consumer Portfolio Segment [Member] \| Financial Asset, Not Past Due [Member] \| Term Loans Originated in 2020 [Member]
Loans		35,783
Consumer Portfolio Segment [Member] \| Financial Asset, Not Past Due [Member] \| Term Loans Originated in 2021 [Member]
Loans		76,126
Consumer Portfolio Segment [Member] \| Financial Asset, Not Past Due [Member] \| Term Loans Originated in 2022 [Member]
Loans		99,414
Consumer Portfolio Segment [Member] \| Financial Asset, Not Past Due [Member] \| Total Term Loans [Member]
Loans		252,817
Consumer Portfolio Segment [Member] \| Financial Asset, Not Past Due [Member] \| Revolving Loans Amortized Cost Basis [Member]
Loans		20,430
Consumer Portfolio Segment [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Originated prior	160
Originated four years before	277
Originated three years before	600
Originated two years before	2,345
Originated one years before	1,733
Originated current year	332
Revolving Loans Amortized Cost Basis	97
Loans	5,544	5,101
Financing Receivable, Term Loan	5,447
Consumer Portfolio Segment [Member] \| Financial Asset, 30 to 59 Days Past Due [Member] \| Term Loan Originated Prior [Member]
Loans		117
Consumer Portfolio Segment [Member] \| Financial Asset, 30 to 59 Days Past Due [Member] \| Term Loans Originated in 2018 [Member]
Loans		268
Consumer Portfolio Segment [Member] \| Financial Asset, 30 to 59 Days Past Due [Member] \| Term Loans Originated in 2019 [Member]
Loans		572
Consumer Portfolio Segment [Member] \| Financial Asset, 30 to 59 Days Past Due [Member] \| Term Loans Originated in 2020 [Member]
Loans		1,014
Consumer Portfolio Segment [Member] \| Financial Asset, 30 to 59 Days Past Due [Member] \| Term Loans Originated in 2021 [Member]
Loans		1,709
Consumer Portfolio Segment [Member] \| Financial Asset, 30 to 59 Days Past Due [Member] \| Term Loans Originated in 2022 [Member]
Loans		1,359
Consumer Portfolio Segment [Member] \| Financial Asset, 30 to 59 Days Past Due [Member] \| Total Term Loans [Member]
Loans		5,039
Consumer Portfolio Segment [Member] \| Financial Asset, 30 to 59 Days Past Due [Member] \| Revolving Loans Amortized Cost Basis [Member]
Loans		62
Consumer Portfolio Segment [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Originated prior	31
Originated four years before	51
Originated three years before	153
Originated two years before	410
Originated one years before	430
Originated current year	122
Revolving Loans Amortized Cost Basis	45
Loans	1,242	1,850
Financing Receivable, Term Loan	1,197
Consumer Portfolio Segment [Member] \| Financial Asset, 60 to 89 Days Past Due [Member] \| Term Loan Originated Prior [Member]
Loans		42
Consumer Portfolio Segment [Member] \| Financial Asset, 60 to 89 Days Past Due [Member] \| Term Loans Originated in 2018 [Member]
Loans		65
Consumer Portfolio Segment [Member] \| Financial Asset, 60 to 89 Days Past Due [Member] \| Term Loans Originated in 2019 [Member]
Loans		67
Consumer Portfolio Segment [Member] \| Financial Asset, 60 to 89 Days Past Due [Member] \| Term Loans Originated in 2020 [Member]
Loans		275
Consumer Portfolio Segment [Member] \| Financial Asset, 60 to 89 Days Past Due [Member] \| Term Loans Originated in 2021 [Member]
Loans		635
Consumer Portfolio Segment [Member] \| Financial Asset, 60 to 89 Days Past Due [Member] \| Term Loans Originated in 2022 [Member]
Loans		750
Consumer Portfolio Segment [Member] \| Financial Asset, 60 to 89 Days Past Due [Member] \| Total Term Loans [Member]
Loans		1,834
Consumer Portfolio Segment [Member] \| Financial Asset, 60 to 89 Days Past Due [Member] \| Revolving Loans Amortized Cost Basis [Member]
Loans		16
Consumer Portfolio Segment [Member] \| Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Originated prior	0
Originated four years before	8
Originated three years before	88
Originated two years before	143
Originated one years before	138
Originated current year	0
Revolving Loans Amortized Cost Basis	11
Loans	388	628
Financing Receivable, Term Loan	377
Consumer Portfolio Segment [Member] \| Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| Term Loan Originated Prior [Member]
Loans		3
Consumer Portfolio Segment [Member] \| Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| Term Loans Originated in 2018 [Member]
Loans		20
Consumer Portfolio Segment [Member] \| Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| Term Loans Originated in 2019 [Member]
Loans		16
Consumer Portfolio Segment [Member] \| Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| Term Loans Originated in 2020 [Member]
Loans		61
Consumer Portfolio Segment [Member] \| Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| Term Loans Originated in 2021 [Member]
Loans		284
Consumer Portfolio Segment [Member] \| Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| Term Loans Originated in 2022 [Member]
Loans		241
Consumer Portfolio Segment [Member] \| Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| Total Term Loans [Member]
Loans		625
Consumer Portfolio Segment [Member] \| Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| Revolving Loans Amortized Cost Basis [Member]
Loans		3
Pass [Member]
Loans	845,629	941,650
Pass [Member] \| Commercial Portfolio Segment [Member]
Originated prior	20,554	23,891
Originated four years before	4,471	5,549
Originated three years before	12,601	12,557
Originated two years before	31,770	17,293
Originated one years before	22,146	53,928
Originated current year	13,112	23,966
Total Term Loans	104,654	137,184
Revolving Loans Amortized Cost Basis	25,347	31,856
Loans	130,001	169,040
Pass [Member] \| Construction Portfolio Segment [Member]
Originated prior	0	0
Originated four years before	0	0
Originated three years before	0	0
Originated two years before	0	0
Originated one years before	0	0
Originated current year	0	0
Total Term Loans	0	0
Revolving Loans Amortized Cost Basis	5,063	3,088
Loans	5,063	3,088
Pass [Member] \| Commercial Real Estate Portfolio Segment [Member]
Originated prior	172,925	146,588
Originated four years before	68,156	58,473
Originated three years before	69,324	71,440
Originated two years before	68,891	74,016
Originated one years before	50,899	71,618
Originated current year	45,675	55,707
Total Term Loans	475,870	477,842
Revolving Loans Amortized Cost Basis	0	0
Loans	475,870	477,842
Pass [Member] \| Residential Portfolio Segment [Member]
Originated prior	9,606	13,457
Originated four years before	0	0
Originated three years before	0	0
Originated two years before	0	0
Originated one years before	0	0
Originated current year	0	0
Total Term Loans	9,606	13,457
Revolving Loans Amortized Cost Basis	0	0
Loans	9,606	13,457
Pass [Member] \| Consumer Portfolio Segment [Member]
Loans	225,089	278,223
Substandard [Member]
Loans	18,908	15,298
Substandard [Member] \| Commercial Portfolio Segment [Member]
Originated prior	12	12
Originated four years before	2,492	0
Originated three years before	0	0
Originated two years before	2,835	0
Originated one years before	0	0
Originated current year	0	0
Total Term Loans	5,339	12
Revolving Loans Amortized Cost Basis	1,210	565
Loans	6,549	577
Substandard [Member] \| Construction Portfolio Segment [Member]
Originated prior	0	0
Originated four years before	0	0
Originated three years before	0	0
Originated two years before	0	0
Originated one years before	0	0
Originated current year	0	0
Total Term Loans	0	0
Revolving Loans Amortized Cost Basis	0	0
Loans	0	0
Substandard [Member] \| Commercial Real Estate Portfolio Segment [Member]
Originated prior	10,056	8,083
Originated four years before	811	0
Originated three years before	786	2,112
Originated two years before	0	806
Originated one years before	0	0
Originated current year	0	2,264
Total Term Loans	11,653	13,265
Revolving Loans Amortized Cost Basis	0	0
Loans	11,653	13,265
Substandard [Member] \| Residential Portfolio Segment [Member]
Originated prior	329	377
Originated four years before	0	0
Originated three years before	0	0
Originated two years before	0	0
Originated one years before	0	0
Originated current year	0	0
Total Term Loans	329	377
Revolving Loans Amortized Cost Basis	0	0
Loans	329	377
Substandard [Member] \| Consumer Portfolio Segment [Member]
Loans	377	1,079
Doubtful [Member]
Loans	1,479	752
Doubtful [Member] \| Commercial Portfolio Segment [Member]
Originated prior	0	0
Originated four years before	0	0
Originated three years before	0	0
Originated two years before	0	0
Originated one years before	0	0
Originated current year	0	0
Total Term Loans	0	0
Revolving Loans Amortized Cost Basis	0	0
Loans	0	0
Doubtful [Member] \| Construction Portfolio Segment [Member]
Originated prior	0	0
Originated four years before	0	0
Originated three years before	0	0
Originated two years before	0	0
Originated one years before	0	0
Originated current year	0	0
Total Term Loans	0	0
Revolving Loans Amortized Cost Basis	0	0
Loans	0	0
Doubtful [Member] \| Commercial Real Estate Portfolio Segment [Member]
Originated prior	0	0
Originated four years before	0	0
Originated three years before	0	0
Originated two years before	0	0
Originated one years before	0	0
Originated current year	0	0
Total Term Loans	0	0
Revolving Loans Amortized Cost Basis	0	0
Loans	0	0
Doubtful [Member] \| Residential Portfolio Segment [Member]
Originated prior	0	0
Originated four years before	0	0
Originated three years before	0	0
Originated two years before	0	0
Originated one years before	0	0
Originated current year	0	0
Total Term Loans	0	0
Revolving Loans Amortized Cost Basis	0	0
Loans	0	0
Doubtful [Member] \| Consumer Portfolio Segment [Member]
Loans	1,479	752
Unlikely to be Collected Financing Receivable [Member]
Loans	586	788
Unlikely to be Collected Financing Receivable [Member] \| Commercial Portfolio Segment [Member]
Originated prior	0	0
Originated four years before	0	0
Originated three years before	0	0
Originated two years before	0	0
Originated one years before	0	0
Originated current year	0	0
Total Term Loans	0	0
Revolving Loans Amortized Cost Basis	0	0
Loans	0	0
Unlikely to be Collected Financing Receivable [Member] \| Construction Portfolio Segment [Member]
Originated prior	0	0
Originated four years before	0	0
Originated three years before	0	0
Originated two years before	0	0
Originated one years before	0	0
Originated current year	0	0
Total Term Loans	0	0
Revolving Loans Amortized Cost Basis	0	0
Loans	0	0
Unlikely to be Collected Financing Receivable [Member] \| Commercial Real Estate Portfolio Segment [Member]
Originated prior	0	0
Originated four years before	0	0
Originated three years before	0	0
Originated two years before	0	0
Originated one years before	0	0
Originated current year	0	0
Total Term Loans	0	0
Revolving Loans Amortized Cost Basis	0	0
Loans	0	0
Unlikely to be Collected Financing Receivable [Member] \| Residential Portfolio Segment [Member]
Originated prior	0	0
Originated four years before	0	0
Originated three years before	0	0
Originated two years before	0	0
Originated one years before	0	0
Originated current year	0	0
Total Term Loans	0	0
Revolving Loans Amortized Cost Basis	0	0
Loans	0	0
Unlikely to be Collected Financing Receivable [Member] \| Consumer Portfolio Segment [Member]
Loans	$ 586	$ 788

Amount of writeoff of financing receivable, charged against allowance for credit loss.

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 79
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479294/326-20-55-79

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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Amortized cost of financing receivable originated three years prior to current fiscal year. Excludes net investment in lease.

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Amortized cost, before allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease.

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Amount, before allowance for credit loss and revolving loans, of financing receivable.

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No definition available.

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The amount of write off for financing receivable before allowance for credit loss and revolving loans.

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No definition available.

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Amortized cost of financing receivable that is a term loan.

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No definition available.

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