Note 7 - Loans and Related Allowance for Loan Losses - Classes of the Loan Portfolio Summarized by Credit Quality (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Loans, total	$ 867,864	$ 609,140
Commercial And Industrial [Member]
Loans, total	97,160	60,630
Real Estate Construction Porfolio Segment [Member]
Loans, total	35,571	23,709
Real Estate Mortgage Portfolio Segment [Member] \| Residential Loan [Member]
Loans, total	308,519	270,830
Real Estate Mortgage Portfolio Segment [Member] \| Commercial Loans [Member]
Loans, total	406,670	249,490
Consumer Portfolio Segment [Member]
Loans, total	19,944	4,481
Pass [Member]
Loans, total	841,950	591,706
Pass [Member] \| Commercial And Industrial [Member]
Loans, total	90,595	58,539
Pass [Member] \| Real Estate Construction Porfolio Segment [Member]
Loans, total	35,548	23,541
Pass [Member] \| Real Estate Mortgage Portfolio Segment [Member] \| Residential Loan [Member]
Loans, total	302,243	264,481
Pass [Member] \| Real Estate Mortgage Portfolio Segment [Member] \| Commercial Loans [Member]
Loans, total	393,854	240,678
Pass [Member] \| Consumer Portfolio Segment [Member]
Loans, total	19,710	4,467
Special Mention [Member]
Loans, total	8,076	5,657
Special Mention [Member] \| Commercial And Industrial [Member]
Loans, total	2,373	663
Special Mention [Member] \| Real Estate Construction Porfolio Segment [Member]
Loans, total		144
Special Mention [Member] \| Real Estate Mortgage Portfolio Segment [Member] \| Residential Loan [Member]
Loans, total	908	428
Special Mention [Member] \| Real Estate Mortgage Portfolio Segment [Member] \| Commercial Loans [Member]
Loans, total	4,795	4,422
Substandard [Member]
Loans, total	17,838	11,777
Substandard [Member] \| Commercial And Industrial [Member]
Loans, total	4,192	1,428
Substandard [Member] \| Real Estate Construction Porfolio Segment [Member]
Loans, total	23	24
Substandard [Member] \| Real Estate Mortgage Portfolio Segment [Member] \| Residential Loan [Member]
Loans, total	5,368	5,921
Substandard [Member] \| Real Estate Mortgage Portfolio Segment [Member] \| Commercial Loans [Member]
Loans, total	8,021	4,390
Substandard [Member] \| Consumer Portfolio Segment [Member]
Loans, total	234	$ 14
Doubtful [Member]
Loans, total
Doubtful [Member] \| Commercial And Industrial [Member]
Loans, total
Doubtful [Member] \| Real Estate Construction Porfolio Segment [Member]
Loans, total
Doubtful [Member] \| Real Estate Mortgage Portfolio Segment [Member] \| Residential Loan [Member]
Loans, total
Doubtful [Member] \| Real Estate Mortgage Portfolio Segment [Member] \| Commercial Loans [Member]
Loans, total