Note 3 - Loans - Loans by Loan Portfolio Class (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Commercial and Industrial Portfolio Segment [Member]
Loans	$ 721,956	$ 644,398
Construction and Development Excluding Undeveloped Land Portfolio Segment [Member]
Loans	136,029	134,482
Undevelopment Land Portfolio Segment [Member]
Loans	20,342	21,185
Real Estate Mortgage Portfolio Segment [Member] | Commercial Investment [Member]
Loans	572,438	528,290
Real Estate Mortgage Portfolio Segment [Member] | Owner Occupied Commercial [Member]
Loans	333,862	329,365
Real Estate Mortgage Portfolio Segment [Member] | One to Four Family Residential [Member]
Loans	240,770	226,575
Real Estate Mortgage Portfolio Segment [Member] | Home Equity First Lien [Member]
Loans	52,360	50,115
Real Estate Mortgage Portfolio Segment [Member] | Home Equity Junior Lien [Member]
Loans	65,999	63,066
Real Estate Mortgage Portfolio Segment [Member]
Loans	1,265,429	1,197,411
Consumer Portfolio Segment [Member]
Loans	31,795	35,531
Loans	$ 2,175,551	$ 2,033,007