Note 3 - Loans and Allowance for Loan Losses - Credit Risk Profile Based on Internal Rating Category (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Loans	$ 93,817	$ 85,913
Residential Portfolio Segment [Member]
Loans	43,989	43,036
Commercial Real Estate Portfolio Segment [Member]
Loans	38,077	32,175
Construction and Land Real Estate [Member]
Loans	9,669	9,543
Commercial Portfolio Segment [Member]
Loans	1,428	383
Consumer Portfolio Segment [Member]
Loans	654	776
Pass [Member]
Loans	90,127	82,035
Pass [Member] | Residential Portfolio Segment [Member]
Loans	42,054	40,724
Pass [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans	37,550	31,677
Pass [Member] | Construction and Land Real Estate [Member]
Loans	8,441	8,520
Pass [Member] | Commercial Portfolio Segment [Member]
Loans	1,428	348
Pass [Member] | Consumer Portfolio Segment [Member]
Loans	654	766
Special Mention [Member]
Loans	304	425
Special Mention [Member] | Residential Portfolio Segment [Member]
Loans	304	415
Special Mention [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans
Special Mention [Member] | Construction and Land Real Estate [Member]
Loans
Special Mention [Member] | Commercial Portfolio Segment [Member]
Loans
Special Mention [Member] | Consumer Portfolio Segment [Member]
Loans		10
Substandard [Member]
Loans	3,386	3,453
Substandard [Member] | Residential Portfolio Segment [Member]
Loans	1,631	1,897
Substandard [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans	527	498
Substandard [Member] | Construction and Land Real Estate [Member]
Loans	1,228	1,023
Substandard [Member] | Commercial Portfolio Segment [Member]
Loans		35
Substandard [Member] | Consumer Portfolio Segment [Member]
Loans
Doubtful [Member]
Loans
Doubtful [Member] | Residential Portfolio Segment [Member]
Loans
Doubtful [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans
Doubtful [Member] | Construction and Land Real Estate [Member]
Loans
Doubtful [Member] | Commercial Portfolio Segment [Member]
Loans
Doubtful [Member] | Consumer Portfolio Segment [Member]
Loans