Note 5 - Retail Loans by Credit Quality (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable Recorded Investment [Line Items]
Total	$ 1,093,771,000	$ 1,039,637,000
Total Retail Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total			$ 173,347,000
Performing Financial Instruments [Member] | Total Retail Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total			172,422,000
Nonperforming Financial Instruments [Member] | Total Retail Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total			925,000
Retail Portfolio Segment [Member]
Financing Receivable Recorded Investment [Line Items]
Revolving	4,534,000
Retail Portfolio Segment [Member] | Consumer Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total		4,113,000	4,113,000
Retail Portfolio Segment [Member] | Family Residential Mortgages [Member]
Financing Receivable Recorded Investment [Line Items]
2023	12,641,000
2022	14,635,000
2021	30,495,000
2020	20,304,000
2019	4,526,000
Prior	26,305,000
Revolving	0
Total	108,906,000	105,654,000	105,654,000
Retail Portfolio Segment [Member] | Construction - Individual [Member]
Financing Receivable Recorded Investment [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving	0
Total	0
Retail Portfolio Segment [Member] | Revolving Home Equity Secured By 1-4 Family Properties-Personal [Member]
Financing Receivable Recorded Investment [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving	34,231,000
Total	34,231,000
Retail Portfolio Segment [Member] | Real Estate Secured By First Lein on 1-4 Family Properties-Personal [Member]
Financing Receivable Recorded Investment [Line Items]
2023	2,591,000
2022	1,613,000
2021	2,933,000
2020	1,030,000
2019	931,000
Prior	2,883,000
Revolving	0
Total	11,981,000
Retail Portfolio Segment [Member] | Real Estate Secured By Junior Lien on 1-4 Family Properties-Personal [Member]
Financing Receivable Recorded Investment [Line Items]
2023	6,438,000
2022	1,632,000
2021	2,184,000
2020	1,180,000
2019	676,000
Prior	3,515,000
Revolving	0
Total	15,625,000
Retail Portfolio Segment [Member] | Student Loans [Member]
Financing Receivable Recorded Investment [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	1,662,000
Revolving	0
Total	1,662,000
Retail Portfolio Segment [Member] | Overdrafts [Member]
Financing Receivable Recorded Investment [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving	194,000
Total	194,000
Retail Portfolio Segment [Member] | Other Consumer [Member]
Financing Receivable Recorded Investment [Line Items]
2023	793,000
2022	290,000
2021	245,000
2020	89,000
2019	73,000
Prior	78,000
Revolving	189,000
Total	1,757,000
Retail Portfolio Segment [Member] | Home Equity Loans and Lines [Member]
Financing Receivable Recorded Investment [Line Items]
Total		$ 63,580,000	63,580,000
Retail Portfolio Segment [Member] | Total Retail Loans [Member]
Financing Receivable Recorded Investment [Line Items]
2023	22,463,000
2022	18,170,000
2021	35,857,000
2020	22,603,000
2019	6,206,000
Prior	34,443,000
Revolving	34,614,000
Total	174,356,000
Retail Portfolio Segment [Member] | Performing Financial Instruments [Member] | Consumer Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total			4,051,000
Retail Portfolio Segment [Member] | Performing Financial Instruments [Member] | Family Residential Mortgages [Member]
Financing Receivable Recorded Investment [Line Items]
2023	12,641,000
2022	14,635,000
2021	30,495,000
2020	20,304,000
2019	4,526,000
Prior	25,500,000
Revolving	0
Total	108,101,000		105,193,000
Retail Portfolio Segment [Member] | Performing Financial Instruments [Member] | Construction - Individual [Member]
Financing Receivable Recorded Investment [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving	0
Total	0
Retail Portfolio Segment [Member] | Performing Financial Instruments [Member] | Revolving Home Equity Secured By 1-4 Family Properties-Personal [Member]
Financing Receivable Recorded Investment [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving	33,936,000
Total	33,936,000
Retail Portfolio Segment [Member] | Performing Financial Instruments [Member] | Real Estate Secured By First Lein on 1-4 Family Properties-Personal [Member]
Financing Receivable Recorded Investment [Line Items]
2023	2,591,000
2022	1,613,000
2021	2,933,000
2020	1,030,000
2019	931,000
Prior	2,767,000
Revolving	0
Total	11,865,000
Retail Portfolio Segment [Member] | Performing Financial Instruments [Member] | Real Estate Secured By Junior Lien on 1-4 Family Properties-Personal [Member]
Financing Receivable Recorded Investment [Line Items]
2023	6,438,000
2022	1,613,000
2021	2,184,000
2020	1,180,000
2019	676,000
Prior	3,515,000
Revolving	0
Total	15,606,000
Retail Portfolio Segment [Member] | Performing Financial Instruments [Member] | Student Loans [Member]
Financing Receivable Recorded Investment [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	1,645,000
Revolving	0
Total	1,645,000
Retail Portfolio Segment [Member] | Performing Financial Instruments [Member] | Overdrafts [Member]
Financing Receivable Recorded Investment [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving	194,000
Total	194,000
Retail Portfolio Segment [Member] | Performing Financial Instruments [Member] | Other Consumer [Member]
Financing Receivable Recorded Investment [Line Items]
2023	793,000
2022	290,000
2021	245,000
2020	89,000
2019	73,000
Prior	41,000
Revolving	189,000
Total	1,720,000
Retail Portfolio Segment [Member] | Performing Financial Instruments [Member] | Home Equity Loans and Lines [Member]
Financing Receivable Recorded Investment [Line Items]
Total			63,178,000
Retail Portfolio Segment [Member] | Performing Financial Instruments [Member] | Total Retail Loans [Member]
Financing Receivable Recorded Investment [Line Items]
2023	22,463,000
2022	18,151,000
2021	35,857,000
2020	22,603,000
2019	6,206,000
Prior	33,468,000
Revolving	34,319,000
Total	173,067,000
Retail Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | Consumer Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total			62,000
Retail Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | Family Residential Mortgages [Member]
Financing Receivable Recorded Investment [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	805,000
Revolving	0
Total	805,000		461,000
Retail Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | Construction - Individual [Member]
Financing Receivable Recorded Investment [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving	0
Total	0
Retail Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | Revolving Home Equity Secured By 1-4 Family Properties-Personal [Member]
Financing Receivable Recorded Investment [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving	295,000
Total	295,000
Retail Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | Real Estate Secured By First Lein on 1-4 Family Properties-Personal [Member]
Financing Receivable Recorded Investment [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	116,000
Revolving	0
Total	116,000
Retail Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | Real Estate Secured By Junior Lien on 1-4 Family Properties-Personal [Member]
Financing Receivable Recorded Investment [Line Items]
2023	0
2022	19,000
2021	0
2020	0
2019	0
Prior	0
Revolving	0
Total	19,000
Retail Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | Student Loans [Member]
Financing Receivable Recorded Investment [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	17,000
Revolving	0
Total	17,000
Retail Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | Overdrafts [Member]
Financing Receivable Recorded Investment [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving	0
Total	0
Retail Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | Other Consumer [Member]
Financing Receivable Recorded Investment [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	37,000
Revolving	0
Total	37,000
Retail Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | Home Equity Loans and Lines [Member]
Financing Receivable Recorded Investment [Line Items]
Total			$ 402,000
Retail Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | Total Retail Loans [Member]
Financing Receivable Recorded Investment [Line Items]
2023	0
2022	19,000
2021	0
2020	0
2019	0
Prior	975,000
Revolving	295,000
Total	$ 1,289,000