Note 5 - Loans - Non-accrual Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Non-accrual loans	$ 5,295	$ 7,693
Commercial and Industrial Portfolio Segment [Member]
Non-accrual loans	1,767	3,643
Construction and Development Excluding Undeveloped Land Portfolio Segment [Member]
Non-accrual loans	538
Undevelopment Land Portfolio Segment [Member]
Non-accrual loans	474
Real Estate Mortgage Portfolio Segment [Member]
Non-accrual loans	2,516	4,050
Real Estate Mortgage Portfolio Segment [Member] | Commercial Investment [Member]
Non-accrual loans	107	278
Real Estate Mortgage Portfolio Segment [Member] | Owner Occupied Commercial [Member]
Non-accrual loans	1,042	2,761
Real Estate Mortgage Portfolio Segment [Member] | One to Four Family Residential [Member]
Non-accrual loans	984	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	383	92
Consumer Portfolio Segment [Member]
Non-accrual loans