Note 3 - Loans - Loans by Loan Portfolio Class (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Commercial and Industrial Portfolio Segment [Member]
Loans	$ 708,508	$ 644,398
Construction and Development Excluding Undeveloped Land Portfolio Segment [Member]
Loans	171,994	134,482
Undevelopment Land Portfolio Segment [Member]
Loans	19,993	21,185
Real Estate Mortgage Portfolio Segment [Member] | Commercial Investment [Member]
Loans	510,128	436,989
Real Estate Mortgage Portfolio Segment [Member] | Owner Occupied Commercial [Member]
Loans	412,733	420,666
Real Estate Mortgage Portfolio Segment [Member] | One to Four Family Residential [Member]
Loans	245,229	226,575
Real Estate Mortgage Portfolio Segment [Member] | Home Equity First Lien [Member]
Loans	54,837	50,115
Real Estate Mortgage Portfolio Segment [Member] | Home Equity Junior Lien [Member]
Loans	65,605	63,066
Real Estate Mortgage Portfolio Segment [Member]
Loans	1,288,532	1,197,411
Consumer Portfolio Segment [Member]
Loans	33,679	35,531
Loans	$ 2,222,706	$ 2,033,007