Note 5 - Allowances for Loan Losses - Non-accrual Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Non-accrual loans	$ 10,341	$ 14,845
Commercial Real Estate Portfolio Segment [Member]
Non-accrual loans	4,631	8,963
Construction and Land Development Portfolio Segment [Member]
Non-accrual loans
Commercial Portfolio Segment [Member]
Non-accrual loans	3,661	2,895
Owner Occupied Real Estate [Member]
Non-accrual loans	1,188	2,136
Consumer Portfolio Segment [Member]
Non-accrual loans	861	851
Residential Portfolio Segment [Member]
Non-accrual loans