Note 5 - Non-accrual Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	$ 0	$ 0
Loans receivable	1,940	4,820
State and Political Subdivisions [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0
Loans receivable	0
Commercial Portfolio Segment [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0
Loans receivable	0
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0	0
Loans receivable	311	1,575
Commercial Portfolio Segment [Member] | Real Estate Secured by Multi-Family Properties [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0
Loans receivable	0
Commercial Portfolio Segment [Member] | Real Estate Secured By Owner-Occupied Properties [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0
Loans receivable	175
Commercial Portfolio Segment [Member] | Real Estate Secured by Other Commercial Properties [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0
Loans receivable	0
Commercial Portfolio Segment [Member] | Revolving real estate secured by 1-4 family properties-business
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0
Loans receivable	0
Commercial Portfolio Segment [Member] | Real estate secured by 1st lein on 1-4 family properties-business
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0
Loans receivable	0
Commercial Portfolio Segment [Member] | Real estate secured by junior lein on 1-4 family properties-business
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0
Loans receivable	165
Commercial Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable		0
Loans receivable		0
Commercial Portfolio Segment [Member] | Secured by Commercial Real Estate [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable		0
Loans receivable		2,031
Commercial Portfolio Segment [Member] | Secured by Residential Real Estate [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable		0
Loans receivable		289
State and Political Subdivisions Portfolio Segment [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable		0
Loans receivable		0
Retail Portfolio Segment [Member] | Consumer Loans [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable		0
Loans receivable		62
Retail Portfolio Segment [Member] | 1-4 Family Residential Mortgages [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0
Loans receivable	805
Retail Portfolio Segment [Member] | Construction - Individual [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0
Retail Portfolio Segment [Member] | Revolving home equity secured by 1-4 family properties-personal
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	295
Retail Portfolio Segment [Member] | Real Estate Secured By 1st Lein on 1-4 Family Properties-Personal
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	116
Retail Portfolio Segment [Member] | Real estate secured by junior lein on 1-4 family properties-personal
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	19
Retail Portfolio Segment [Member] | Student Loans [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	17
Retail Portfolio Segment [Member] | Other consumer [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	37
Retail Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0
Retail Portfolio Segment [Member] | Secured by Residential Real Estate [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0
Retail Portfolio Segment [Member] | Family Residential Mortgages [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable		0
Loans receivable		461
Retail Portfolio Segment [Member] | Home Equity Loans and Lines [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable		0
Loans receivable		$ 402
Nonaccrual With No Specifically-Related ACL | State and Political Subdivisions [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0
Nonaccrual With No Specifically-Related ACL | Commercial Portfolio Segment [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0
Nonaccrual With No Specifically-Related ACL | Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	278
Nonaccrual With No Specifically-Related ACL | Commercial Portfolio Segment [Member] | Real Estate Secured by Multi-Family Properties [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0
Nonaccrual With No Specifically-Related ACL | Commercial Portfolio Segment [Member] | Real Estate Secured By Owner-Occupied Properties [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	175
Nonaccrual With No Specifically-Related ACL | Commercial Portfolio Segment [Member] | Real Estate Secured by Other Commercial Properties [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0
Nonaccrual With No Specifically-Related ACL | Commercial Portfolio Segment [Member] | Revolving real estate secured by 1-4 family properties-business
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0
Nonaccrual With No Specifically-Related ACL | Commercial Portfolio Segment [Member] | Real estate secured by 1st lein on 1-4 family properties-business
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0
Nonaccrual With No Specifically-Related ACL | Commercial Portfolio Segment [Member] | Real estate secured by junior lein on 1-4 family properties-business
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0
Nonaccrual With No Specifically-Related ACL | Retail Portfolio Segment [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	1,468
Nonaccrual With No Specifically-Related ACL | Retail Portfolio Segment [Member] | 1-4 Family Residential Mortgages [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	805
Nonaccrual With No Specifically-Related ACL | Retail Portfolio Segment [Member] | Construction - Individual [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0
Nonaccrual With No Specifically-Related ACL | Retail Portfolio Segment [Member] | Revolving home equity secured by 1-4 family properties-personal
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	21
Nonaccrual With No Specifically-Related ACL | Retail Portfolio Segment [Member] | Real Estate Secured By 1st Lein on 1-4 Family Properties-Personal
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	116
Nonaccrual With No Specifically-Related ACL | Retail Portfolio Segment [Member] | Real estate secured by junior lein on 1-4 family properties-personal
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	19
Nonaccrual With No Specifically-Related ACL | Retail Portfolio Segment [Member] | Student Loans [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	17
Nonaccrual With No Specifically-Related ACL | Retail Portfolio Segment [Member] | Other consumer [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	37
Nonaccrual With Related ACL
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	472
Nonaccrual With Related ACL | State and Political Subdivisions [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0
Nonaccrual With Related ACL | Commercial Portfolio Segment [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0
Nonaccrual With Related ACL | Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	33
Nonaccrual With Related ACL | Commercial Portfolio Segment [Member] | Real Estate Secured by Multi-Family Properties [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0
Nonaccrual With Related ACL | Commercial Portfolio Segment [Member] | Real Estate Secured By Owner-Occupied Properties [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0
Nonaccrual With Related ACL | Commercial Portfolio Segment [Member] | Real Estate Secured by Other Commercial Properties [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0
Nonaccrual With Related ACL | Commercial Portfolio Segment [Member] | Revolving real estate secured by 1-4 family properties-business
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0
Nonaccrual With Related ACL | Commercial Portfolio Segment [Member] | Real estate secured by 1st lein on 1-4 family properties-business
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0
Nonaccrual With Related ACL | Commercial Portfolio Segment [Member] | Real estate secured by junior lein on 1-4 family properties-business
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	165
Nonaccrual With Related ACL | Retail Portfolio Segment [Member] | 1-4 Family Residential Mortgages [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0
Nonaccrual With Related ACL | Retail Portfolio Segment [Member] | Revolving home equity secured by 1-4 family properties-personal
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	274
Nonaccrual With Related ACL | Retail Portfolio Segment [Member] | Real Estate Secured By 1st Lein on 1-4 Family Properties-Personal
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0
Nonaccrual With Related ACL | Retail Portfolio Segment [Member] | Real estate secured by junior lein on 1-4 family properties-personal
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0
Nonaccrual With Related ACL | Retail Portfolio Segment [Member] | Other consumer [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0
Nonaccrual With Related ACL | Retail Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	0
Nonaccrual With Related ACL | Retail Portfolio Segment [Member] | Secured by Residential Real Estate [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Loans receivable	$ 0