Note 9 - Allowance for Loan Losses and Credit Quality Information - Classified and Unclassified Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Loans receivable	$ 590,762	$ 594,856
Classified [Member]
Loans receivable	28,763	32,591
Classified [Member] | Special Mention [Member]
Loans receivable	15,919	17,240
Classified [Member] | Substandard [Member]
Loans receivable	12,709	15,164
Classified [Member] | Doubtful [Member]
Loans receivable	66	81
Classified [Member] | Unlikely to be Collected Financing Receivable [Member]
Loans receivable	69	106
Unclassified [Member]
Loans receivable	561,999	562,265
Residential Portfolio Segment [Member]
Loans receivable	113,062	110,698
Residential Portfolio Segment [Member] | Classified [Member]
Loans receivable	2,873	1,961
Residential Portfolio Segment [Member] | Classified [Member] | Special Mention [Member]
Loans receivable	1,134	150
Residential Portfolio Segment [Member] | Classified [Member] | Substandard [Member]
Loans receivable	1,703	1,771
Residential Portfolio Segment [Member] | Classified [Member] | Doubtful [Member]
Loans receivable	36	40
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	110,189	108,737
Commercial Real Estate Portfolio Segment [Member]
Loans receivable	338,245	336,130
Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member]
Loans receivable	181,904	195,564
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Other [Member]
Loans receivable	156,341	140,566
Commercial Real Estate Portfolio Segment [Member] | Classified [Member] | Real Estate Loan [Member]
Loans receivable	8,632	10,369
Commercial Real Estate Portfolio Segment [Member] | Classified [Member] | Commercial Real Estate Other [Member]
Loans receivable	8,815	9,997
Commercial Real Estate Portfolio Segment [Member] | Classified [Member] | Special Mention [Member] | Real Estate Loan [Member]
Loans receivable	4,905	5,564
Commercial Real Estate Portfolio Segment [Member] | Classified [Member] | Special Mention [Member] | Commercial Real Estate Other [Member]
Loans receivable	4,132	4,879
Commercial Real Estate Portfolio Segment [Member] | Classified [Member] | Substandard [Member] | Real Estate Loan [Member]
Loans receivable	3,727	4,805
Commercial Real Estate Portfolio Segment [Member] | Classified [Member] | Substandard [Member] | Commercial Real Estate Other [Member]
Loans receivable	4,683	5,118
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	173,272	185,195
Commercial Real Estate Portfolio Segment [Member] | Unclassified [Member] | Commercial Real Estate Other [Member]
Loans receivable	147,526	130,569
Consumer Portfolio Segment [Member]
Loans receivable	73,125	72,532
Consumer Portfolio Segment [Member] | Classified [Member]
Loans receivable	838	856
Consumer Portfolio Segment [Member] | Classified [Member] | Special Mention [Member]
Loans receivable	0	0
Consumer Portfolio Segment [Member] | Classified [Member] | Substandard [Member]
Loans receivable	739	709
Consumer Portfolio Segment [Member] | Classified [Member] | Doubtful [Member]
Loans receivable	30	41
Consumer Portfolio Segment [Member] | Classified [Member] | Unlikely to be Collected Financing Receivable [Member]
Loans receivable	69	106
Consumer Portfolio Segment [Member] | Unclassified [Member]
Loans receivable	72,287	71,676
Commercial Portfolio Segment [Member]
Loans receivable	66,330	75,496
Commercial Portfolio Segment [Member] | Classified [Member]
Loans receivable	7,605	9,408
Commercial Portfolio Segment [Member] | Classified [Member] | Special Mention [Member]
Loans receivable	5,748	6,647
Commercial Portfolio Segment [Member] | Classified [Member] | Substandard [Member]
Loans receivable	1,857	2,761
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	$ 58,725	$ 66,088