Note 8 - Other Real Estate Owned - Changes in OREO (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Balance at beginning of year	$ 759	$ 1,423	$ 502
Additions	1,071	189	4,059
Dispositions	(1,743)	(745)	(3,138)
Valuation adjustments	(52)	(108)
Balance at ending of year	$ 35	$ 759	$ 1,423