Note 3 - Loans and Allowance for Loan Losses - Aging of Recorded Investment in Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Past Due	$ 5,818	$ 5,282
Current	383,238	379,852
Loans	389,652	385,764
Receivables Acquired with Deteriorated Credit Quality [Member]
Loans	596	630
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]
Past Due	4,582	4,172
Current	132,258	133,815
Loans	137,234	138,377
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Loans	394	390
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]
Past Due	75	52
Current	16,230	13,899
Loans	16,305	13,951
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Loans	0	0
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member]
Past Due	0	0
Current	22,703	19,489
Loans	22,703	19,489
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Loans	0	0
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]
Past Due	447	27
Current	92,373	96,402
Loans	93,022	96,669
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Loans	202	240
Commercial Portfolio Segment [Member]
Past Due	135	238
Current	26,034	23,888
Loans	26,169	24,126
Commercial Portfolio Segment [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Loans	0	0
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]
Past Due	319	365
Current	45,099	43,466
Loans	45,418	43,831
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Loans	0	0
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]
Past Due	260	428
Current	48,541	48,893
Loans	48,801	49,321
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Loans	0	0
Financing Receivables, 30 to 59 Days Past Due [Member]
Past Due	4,085	3,270
Financing Receivables, 30 to 59 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]
Past Due	3,176	2,444
Financing Receivables, 30 to 59 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]
Past Due	75	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member]
Past Due	0	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]
Past Due	420	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member]
Past Due	70	155
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]
Past Due	145	352
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]
Past Due	199	319
Financing Receivables, 60 to 89 Days Past Due [Member]
Past Due	647	825
Financing Receivables, 60 to 89 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]
Past Due	563	707
Financing Receivables, 60 to 89 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]
Past Due	0	52
Financing Receivables, 60 to 89 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member]
Past Due	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]
Past Due	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member]
Past Due	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]
Past Due	60	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]
Past Due	24	66
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past Due	1,086	1,187
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]
Past Due	843	1,021
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]
Past Due	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member]
Past Due	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]
Past Due	27	27
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member]
Past Due	65	83
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]
Past Due	114	13
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]
Past Due	$ 37	$ 43