Note 5 - Allowance for Loan Losses - Non-accrual Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Non-accrual loans	$ 18,594	$ 12,622
Commercial Real Estate Portfolio Segment [Member]
Non-accrual loans	13,089	5,913
Construction and Land Development Portfolio Segment [Member]
Non-accrual loans		117
Commercial Portfolio Segment [Member]
Non-accrual loans	3,151	3,156
Owner Occupied Real Estate [Member]
Non-accrual loans	1,546	2,894
Consumer Portfolio Segment [Member]
Non-accrual loans	808	542
Residential Portfolio Segment [Member]
Non-accrual loans