Note 9 - Allowance for Loan Losses and Credit Quality Information - Classified and Unclassified Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Loans receivable	$ 688,926	$ 662,000
Classified [Member]
Loans receivable	41,093	42,709
Classified [Member] | Special Mention [Member]
Loans receivable	23,793	25,179
Classified [Member] | Substandard [Member]
Loans receivable	17,136	17,403
Classified [Member] | Doubtful [Member]
Loans receivable	74	77
Classified [Member] | Unlikely to be Collected Financing Receivable [Member]
Loans receivable	90	50
Unclassified [Member]
Loans receivable	647,833	619,291
Residential Portfolio Segment [Member]
Loans receivable	168,481	163,322
Residential Portfolio Segment [Member] | Classified [Member]
Loans receivable	1,123	1,257
Residential Portfolio Segment [Member] | Classified [Member] | Special Mention [Member]
Loans receivable	134	410
Residential Portfolio Segment [Member] | Classified [Member] | Substandard [Member]
Loans receivable	935	791
Residential Portfolio Segment [Member] | Classified [Member] | Doubtful [Member]
Loans receivable	54	56
Residential Portfolio Segment [Member] | Classified [Member] | Unlikely to be Collected Financing Receivable [Member]
Loans receivable	0	0
Residential Portfolio Segment [Member] | Unclassified [Member]
Loans receivable	167,358	162,065
Commercial Real Estate Portfolio Segment [Member]
Loans receivable	407,454	396,868
Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member]
Loans receivable	213,559	209,666
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Other [Member]
Loans receivable	193,895	187,202
Commercial Real Estate Portfolio Segment [Member] | Classified [Member] | Real Estate Loan [Member]
Loans receivable	20,201	20,765
Commercial Real Estate Portfolio Segment [Member] | Classified [Member] | Commercial Real Estate Other [Member]
Loans receivable	15,614	16,395
Commercial Real Estate Portfolio Segment [Member] | Classified [Member] | Special Mention [Member] | Real Estate Loan [Member]
Loans receivable	15,470	16,012
Commercial Real Estate Portfolio Segment [Member] | Classified [Member] | Special Mention [Member] | Commercial Real Estate Other [Member]
Loans receivable	6,296	6,824
Commercial Real Estate Portfolio Segment [Member] | Classified [Member] | Substandard [Member] | Real Estate Loan [Member]
Loans receivable	4,731	4,753
Commercial Real Estate Portfolio Segment [Member] | Classified [Member] | Substandard [Member] | Commercial Real Estate Other [Member]
Loans receivable	9,318	9,571
Commercial Real Estate Portfolio Segment [Member] | Classified [Member] | Doubtful [Member] | Real Estate Loan [Member]
Loans receivable	0	0
Commercial Real Estate Portfolio Segment [Member] | Classified [Member] | Doubtful [Member] | Commercial Real Estate Other [Member]
Loans receivable	0	0
Commercial Real Estate Portfolio Segment [Member] | Classified [Member] | Unlikely to be Collected Financing Receivable [Member] | Real Estate Loan [Member]
Loans receivable	0	0
Commercial Real Estate Portfolio Segment [Member] | Classified [Member] | Unlikely to be Collected Financing Receivable [Member] | Commercial Real Estate Other [Member]
Loans receivable	0	0
Commercial Real Estate Portfolio Segment [Member] | Unclassified [Member] | Real Estate Loan [Member]
Loans receivable	193,358	188,901
Commercial Real Estate Portfolio Segment [Member] | Unclassified [Member] | Commercial Real Estate Other [Member]
Loans receivable	178,281	170,807
Consumer Portfolio Segment [Member]
Loans receivable	41,031	41,645
Consumer Portfolio Segment [Member] | Classified [Member]
Loans receivable	523	546
Consumer Portfolio Segment [Member] | Classified [Member] | Special Mention [Member]
Loans receivable	0	0
Consumer Portfolio Segment [Member] | Classified [Member] | Substandard [Member]
Loans receivable	413	475
Consumer Portfolio Segment [Member] | Classified [Member] | Doubtful [Member]
Loans receivable	20	21
Consumer Portfolio Segment [Member] | Classified [Member] | Unlikely to be Collected Financing Receivable [Member]
Loans receivable	90	50
Consumer Portfolio Segment [Member] | Unclassified [Member]
Loans receivable	40,508	41,099
Commercial Portfolio Segment [Member]
Loans receivable	71,960	60,165
Commercial Portfolio Segment [Member] | Classified [Member]
Loans receivable	3,632	3,746
Commercial Portfolio Segment [Member] | Classified [Member] | Special Mention [Member]
Loans receivable	1,893	1,933
Commercial Portfolio Segment [Member] | Classified [Member] | Substandard [Member]
Loans receivable	1,739	1,813
Commercial Portfolio Segment [Member] | Classified [Member] | Doubtful [Member]
Loans receivable	0	0
Commercial Portfolio Segment [Member] | Classified [Member] | Unlikely to be Collected Financing Receivable [Member]
Loans receivable	0	0
Commercial Portfolio Segment [Member] | Unclassified [Member]
Loans receivable	$ 68,328	$ 56,419