Note 9 - Allowance for Loan Losses and Credit Quality Information - Aging of Past Due Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021
Loans receivable	$ 688,442		$ 662,000
Loans 90 days or more past due and still accruing		$ 0	0
Residential Portfolio Segment [Member]
Loans receivable	173,833		163,322
Loans 90 days or more past due and still accruing		0	0
Commercial Real Estate Portfolio Segment [Member]
Loans receivable	411,155		396,868
Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member]
Loans receivable	213,101		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	198,054		187,202
Loans 90 days or more past due and still accruing		0	0
Consumer Portfolio Segment [Member]
Loans receivable	43,310		41,645
Loans 90 days or more past due and still accruing		0	0
Commercial Portfolio Segment [Member]
Loans receivable	60,144		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	2,581		1,462
Financial Asset, 30 to 59 Days Past Due [Member] | Residential Portfolio Segment [Member]
Loans receivable	2,381		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	0		226
Financial Asset, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member]
Loans receivable	200		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	190		3,556
Financial Asset, 60 to 89 Days Past Due [Member] | Residential Portfolio Segment [Member]
Loans receivable	116		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	74		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	359		275
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Residential Portfolio Segment [Member]
Loans receivable	286		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	73		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	3,130		5,293
Financial Asset, Past Due [Member] | Residential Portfolio Segment [Member]
Loans receivable	2,783		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	0		3,628
Financial Asset, Past Due [Member] | Consumer Portfolio Segment [Member]
Loans receivable	347		385
Financial Asset, Past Due [Member] | Commercial Portfolio Segment [Member]
Loans receivable	0		0
Financial Asset, Not Past Due [Member]
Loans receivable	685,312		656,707
Financial Asset, Not Past Due [Member] | Residential Portfolio Segment [Member]
Loans receivable	171,050		162,240
Financial Asset, Not Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member]
Loans receivable	213,101		209,468
Financial Asset, Not Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Other [Member]
Loans receivable	198,054		183,574
Financial Asset, Not Past Due [Member] | Consumer Portfolio Segment [Member]
Loans receivable	42,963		41,260
Financial Asset, Not Past Due [Member] | Commercial Portfolio Segment [Member]
Loans receivable	$ 60,144		$ 60,165