Note 3 - Loans and Allowance for Loan Losses - Recorded Investment in Loans by Risk Category (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Loans	$ 389,652	$ 385,764
Pass [Member]
Loans	376,328	372,497
Special Mention [Member]
Loans	2,986	3,087
Substandard [Member]
Loans	6,898	6,863
Doubtful [Member]
Loans	3,440	3,317
Unlikely to be Collected Financing Receivable [Member]
Loans	0	0
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]
Loans	137,234	138,377
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] | Pass [Member]
Loans	133,720	135,328
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] | Special Mention [Member]
Loans	394	403
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] | Substandard [Member]
Loans	1,038	721
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] | Doubtful [Member]
Loans	2,082	1,925
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] | Unlikely to be Collected Financing Receivable [Member]
Loans	0	0
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]
Loans	16,305	13,951
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member] | Pass [Member]
Loans	16,150	13,795
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member] | Special Mention [Member]
Loans	85	86
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member] | Substandard [Member]
Loans	70	70
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member] | Doubtful [Member]
Loans	0	0
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member] | Unlikely to be Collected Financing Receivable [Member]
Loans	0	0
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member]
Loans	22,703	19,489
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member] | Pass [Member]
Loans	22,703	19,489
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member] | Special Mention [Member]
Loans	0	0
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member] | Substandard [Member]
Loans	0	0
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member] | Doubtful [Member]
Loans	0	0
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member] | Unlikely to be Collected Financing Receivable [Member]
Loans	0	0
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]
Loans	93,022	96,669
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Pass [Member]
Loans	84,487	87,782
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Special Mention [Member]
Loans	1,843	1,892
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Substandard [Member]
Loans	5,709	5,991
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Doubtful [Member]
Loans	983	1,004
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Unlikely to be Collected Financing Receivable [Member]
Loans	0	0
Commercial Portfolio Segment [Member]
Loans	26,169	24,126
Commercial Portfolio Segment [Member] | Pass [Member]
Loans	25,320	23,246
Commercial Portfolio Segment [Member] | Special Mention [Member]
Loans	648	661
Commercial Portfolio Segment [Member] | Substandard [Member]
Loans	78	77
Commercial Portfolio Segment [Member] | Doubtful [Member]
Loans	123	142
Commercial Portfolio Segment [Member] | Unlikely to be Collected Financing Receivable [Member]
Loans	0	0
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]
Loans	45,418	43,831
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member] | Pass [Member]
Loans	45,190	43,601
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member] | Special Mention [Member]
Loans	0	0
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member] | Substandard [Member]
Loans	3	4
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member] | Doubtful [Member]
Loans	225	226
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member] | Unlikely to be Collected Financing Receivable [Member]
Loans	0	0
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]
Loans	48,801	49,321
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member] | Pass [Member]
Loans	48,758	49,256
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member] | Special Mention [Member]
Loans	16	45
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member] | Substandard [Member]
Loans	0	0
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member] | Doubtful [Member]
Loans	27	20
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member] | Unlikely to be Collected Financing Receivable [Member]
Loans	$ 0	$ 0