Note 3 - Loans - Non-accrual Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Commercial and Industrial Portfolio Segment [Member]
Non-accrual loans	$ 1,794	$ 3,643
Construction and Development Excluding Undeveloped Land Portfolio Segment [Member]
Non-accrual loans
Undevelopment Land Portfolio Segment [Member]
Non-accrual loans
Real Estate Mortgage Portfolio Segment [Member] | Commercial Investment [Member]
Non-accrual loans	280	278
Real Estate Mortgage Portfolio Segment [Member] | Owner Occupied Commercial [Member]
Non-accrual loans	1,635	2,761
Real Estate Mortgage Portfolio Segment [Member] | One to Four Family Residential [Member]
Non-accrual loans	977	906
Real Estate Mortgage Portfolio Segment [Member] | Home Equity First Lien [Member]
Non-accrual loans		13
Real Estate Mortgage Portfolio Segment [Member] | Home Equity Junior Lien [Member]
Non-accrual loans	253	92
Real Estate Mortgage Portfolio Segment [Member]
Non-accrual loans	3,145	4,050
Consumer Portfolio Segment [Member]
Non-accrual loans	31
Non-accrual loans	$ 4,970	$ 7,693