Note 6 - Allowance for Loan Losses and Credit Quality Information - Aging of Past Due Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Loans receivable	$ 787,887	$ 662,000
Loans 90 days or more past due and still accruing	0	0
Residential Portfolio Segment [Member]
Loans receivable	205,890	163,322
Loans 90 days or more past due and still accruing	0	0
Commercial Real Estate Portfolio Segment [Member]
Loans receivable	471,345	396,868
Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member]
Loans receivable	249,783	209,666
Loans 90 days or more past due and still accruing	0	0
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Other [Member]
Loans receivable	221,562	187,202
Loans 90 days or more past due and still accruing	0	0
Consumer Portfolio Segment [Member]
Loans receivable	44,817	41,645
Loans 90 days or more past due and still accruing	0	0
Commercial Portfolio Segment [Member]
Loans receivable	65,835	60,165
Loans 90 days or more past due and still accruing	0	0
Financial Asset, 30 to 59 Days Past Due [Member]
Loans receivable	1,352	1,462
Financial Asset, 30 to 59 Days Past Due [Member] | Residential Portfolio Segment [Member]
Loans receivable	380	864
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member]
Loans receivable	0	198
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Other [Member]
Loans receivable	578	226
Financial Asset, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member]
Loans receivable	394	174
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member]
Loans receivable	0	0
Financial Asset, 60 to 89 Days Past Due [Member]
Loans receivable	268	3,556
Financial Asset, 60 to 89 Days Past Due [Member] | Residential Portfolio Segment [Member]
Loans receivable	145	65
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member]
Loans receivable	0	0
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Other [Member]
Loans receivable	0	3,402
Financial Asset, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member]
Loans receivable	123	89
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member]
Loans receivable	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans receivable	569	275
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Residential Portfolio Segment [Member]
Loans receivable	481	153
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member]
Loans receivable	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Other [Member]
Loans receivable	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member]
Loans receivable	88	122
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member]
Loans receivable	0	0
Financial Asset, Past Due [Member]
Loans receivable	2,189	5,293
Financial Asset, Past Due [Member] | Residential Portfolio Segment [Member]
Loans receivable	1,006	1,082
Financial Asset, Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member]
Loans receivable	0	198
Financial Asset, Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Other [Member]
Loans receivable	578	3,628
Financial Asset, Past Due [Member] | Consumer Portfolio Segment [Member]
Loans receivable	605	385
Financial Asset, Past Due [Member] | Commercial Portfolio Segment [Member]
Loans receivable	0	0
Financial Asset, Not Past Due [Member]
Loans receivable	785,698	656,707
Financial Asset, Not Past Due [Member] | Residential Portfolio Segment [Member]
Loans receivable	204,884	162,240
Financial Asset, Not Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member]
Loans receivable	249,783	209,468
Financial Asset, Not Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Other [Member]
Loans receivable	220,984	183,574
Financial Asset, Not Past Due [Member] | Consumer Portfolio Segment [Member]
Loans receivable	44,212	41,260
Financial Asset, Not Past Due [Member] | Commercial Portfolio Segment [Member]
Loans receivable	$ 65,835	$ 60,165