Note 5 - Loans and Allowance for Loan Losses - Aging of Recorded Investment in Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Past due	$ 5,282	$ 8,079
Current	379,852	354,513
Loans	385,764	363,942
Receivables Acquired with Deteriorated Credit Quality [Member]
Loans	630	1,350
Residential Mortgage Segment [Member] | Residential Loan [Member]
Past due		5,120
Current		142,571
Loans		148,575
Residential Mortgage Segment [Member] | Residential Loan [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Loans		884
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]
Past due	4,172
Current	133,815
Loans	138,377	148,575
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Loans	390	884
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]
Past due	52	180
Current	13,899	12,858
Loans	13,951	13,038
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	71
Current	19,489	12,545
Loans	19,489	12,616
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	27	1,604
Current	96,402	82,658
Loans	96,669	84,728
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Loans	240	466
Commercial Portfolio Segment [Member]
Past due	238	167
Current	23,888	22,986
Loans	24,126	23,153
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	365	451
Current	43,466	38,726
Loans	43,831	39,177
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	428	486
Current	48,893	42,169
Loans	49,321	42,655
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	3,270	4,468
Financing Receivables, 30 to 59 Days Past Due [Member] | Residential Mortgage Segment [Member] | Residential Loan [Member]
Past due	2,444	3,078
Financing Receivables, 30 to 59 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]
Past due	0	55
Financing Receivables, 30 to 59 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member]
Past due	0	71
Financing Receivables, 30 to 59 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]
Past due	0	435
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member]
Past due	155	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]
Past due	352	365
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]
Past due	319	464
Financing Receivables, 60 to 89 Days Past Due [Member]
Past due	825	1,704
Financing Receivables, 60 to 89 Days Past Due [Member] | Residential Mortgage Segment [Member] | Residential Loan [Member]
Past due	707	786
Financing Receivables, 60 to 89 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]
Past due	52	26
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	773
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member]
Past due	0	100
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]
Past due	0	6
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]
Past due	66	13
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Past due	1,187	1,907
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Residential Mortgage Segment [Member] | Residential Loan [Member]
Past due	1,021	1,256
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]
Past due	0	99
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	396
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member]
Past due	83	67
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]
Past due	13	80
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]
Past due	$ 43	$ 9