Note 4 - Loans Receivable and Related Allowance for Loan Losses - Classes of Loan Portfolio by Aging Categories (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021
Loans	$ 810,676	$ 810,676	$ 790,403
Nonaccrual	3,310		2,654
Financial Asset, Not Past Due [Member]
Loans	801,364		783,741
Nonaccrual	2,482		1,590
Financial Asset, 30 to 59 Days Past Due [Member]
Loans	4,670		2,333
Nonaccrual	8		10
Financial Asset, 60 to 89 Days Past Due [Member]
Loans	834		990
Nonaccrual	68		69
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans	498		685
Nonaccrual	752		985
Residential Portfolio Segment [Member]
Loans	291,779	291,779	273,823
Nonaccrual	697		810
Residential Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Loans	288,478		270,221
Nonaccrual	184		196
Residential Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans	1,964		1,913
Nonaccrual	0		0
Residential Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans	391		588
Nonaccrual	68		69
Residential Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans	249		291
Nonaccrual	445		545
Home Equity Loans and Lines of Credit [Member]
Loans	73,625	73,625	75,810
Nonaccrual	241		242
Home Equity Loans and Lines of Credit [Member] | Financial Asset, Not Past Due [Member]
Loans	72,543		74,853
Nonaccrual	4		4
Home Equity Loans and Lines of Credit [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans	661		230
Nonaccrual	0		0
Home Equity Loans and Lines of Credit [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans	137		325
Nonaccrual	0		0
Home Equity Loans and Lines of Credit [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans	43		160
Nonaccrual	237		238
Commercial Real Estate Portfolio Segment [Member]
Loans	342,041	342,041	326,341
Nonaccrual	2,277		1,250
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Loans	337,842		325,018
Nonaccrual	2,209		1,052
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans	1,815		73
Nonaccrual	8		10
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans	107		0
Nonaccrual	0		0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans	0		0
Nonaccrual	60		188
Commercial Portfolio Segment [Member]
Loans	57,819	57,819	65,877
Nonaccrual	85		338
Commercial Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Loans	57,472		65,305
Nonaccrual	85		338
Commercial Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans	56		0
Nonaccrual	0		0
Commercial Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans	0		0
Nonaccrual	0		0
Commercial Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans	206		234
Nonaccrual	0		0
Consumer Portfolio Segment [Member]
Loans	45,412	$ 45,412	48,552
Nonaccrual	10		14
Consumer Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Loans	45,029		48,344
Nonaccrual	0		0
Consumer Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans	174		117
Nonaccrual	0		0
Consumer Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans	199		77
Nonaccrual	0		0
Consumer Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans	0		0
Nonaccrual	$ 10		$ 14