Note 4 - Allowance for Loan Losses (Details) - Loans by Credit Quality Indicators - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Construction loans:
Loans	$ 360,160	$ 331,679
Pass [Member]
Construction loans:
Loans	352,117	322,240
Special Mention [Member]
Construction loans:
Loans	5,939	7,158
Substandard [Member]
Construction loans:
Loans	1,668	1,027
Substandard Nonaccrual [Member]
Construction loans:
Loans	436	1,254
Construction Loan Portfolio Segment [Member] | Residential [Member]
Construction loans:
Loans	12,398	10,019
Construction Loan Portfolio Segment [Member] | Residential [Member] | Pass [Member]
Construction loans:
Loans	12,398	10,019
Construction Loan Portfolio Segment [Member] | Land Acquisition, Development and Commercial [Member]
Construction loans:
Loans	27,566	23,686
Construction Loan Portfolio Segment [Member] | Land Acquisition, Development and Commercial [Member] | Pass [Member]
Construction loans:
Loans	27,555	23,672
Construction Loan Portfolio Segment [Member] | Land Acquisition, Development and Commercial [Member] | Substandard [Member]
Construction loans:
Loans		14
Construction Loan Portfolio Segment [Member] | Land Acquisition, Development and Commercial [Member] | Substandard Nonaccrual [Member]
Construction loans:
Loans	11
Real Estate Portfolio Segment [Member] | Residential [Member]
Construction loans:
Loans	97,803	86,269
Real Estate Portfolio Segment [Member] | Residential [Member] | Pass [Member]
Construction loans:
Loans	93,311	81,409
Real Estate Portfolio Segment [Member] | Residential [Member] | Special Mention [Member]
Construction loans:
Loans	4,243	4,335
Real Estate Portfolio Segment [Member] | Residential [Member] | Substandard [Member]
Construction loans:
Loans	249	50
Real Estate Portfolio Segment [Member] | Residential [Member] | Substandard Nonaccrual [Member]
Construction loans:
Loans		475
Real Estate Portfolio Segment [Member] | Commercial [Member}
Construction loans:
Loans	139,751	135,070
Real Estate Portfolio Segment [Member] | Commercial [Member} | Pass [Member]
Construction loans:
Loans	136,792	131,087
Real Estate Portfolio Segment [Member] | Commercial [Member} | Special Mention [Member]
Construction loans:
Loans	1,172	2,302
Real Estate Portfolio Segment [Member] | Commercial [Member} | Substandard [Member]
Construction loans:
Loans	1,409	923
Real Estate Portfolio Segment [Member] | Commercial [Member} | Substandard Nonaccrual [Member]
Construction loans:
Loans	378	758
Commercial, Industrial and Agricultural Portfolio Segment [Member]
Construction loans:
Loans	49,649	44,807
Commercial, Industrial and Agricultural Portfolio Segment [Member] | Pass [Member]
Construction loans:
Loans	49,078	44,248
Commercial, Industrial and Agricultural Portfolio Segment [Member] | Special Mention [Member]
Construction loans:
Loans	524	521
Commercial, Industrial and Agricultural Portfolio Segment [Member] | Substandard [Member]
Construction loans:
Loans		38
Commercial, Industrial and Agricultural Portfolio Segment [Member] | Substandard Nonaccrual [Member]
Construction loans:
Loans	47
Equity Lines Portfolio Segment [Member]
Construction loans:
Loans	25,308	24,330
Equity Lines Portfolio Segment [Member] | Pass [Member]
Construction loans:
Loans	25,308	24,330
Consumer Portfolio Segment [Member]
Construction loans:
Loans	7,685	7,498
Consumer Portfolio Segment [Member] | Pass [Member]
Construction loans:
Loans	7,675	7,475
Consumer Portfolio Segment [Member] | Substandard [Member]
Construction loans:
Loans	$ 10	2
Consumer Portfolio Segment [Member] | Substandard Nonaccrual [Member]
Construction loans:
Loans		$ 21