Note 3 - Loans - Covered Loans by Class (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Covered loans	$ 22,919	$ 27,948
Commercial Portfolio Segment [Member]
Covered loans	295	332
Commercial Portfolio Segment [Member] | Construction, Development and Other Land [Member]
Covered loans	35	39
Commercial Portfolio Segment [Member] | Single Family Non-owner Occupied [Member]
Covered loans	252	284
Commercial Portfolio Segment [Member] | Non-farm, Non-residential [Member]
Covered loans	8	9
Consumer Real Estate Portfolio Segment [Member]
Covered loans	22,624	27,616
Consumer Real Estate Portfolio Segment [Member] | Home Equity Lines [Member]
Covered loans	19,151	23,720
Consumer Real Estate Portfolio Segment [Member] | Single Family Owner Occupied [Member]
Covered loans	$ 3,473	$ 3,896