Note 6 - Other Real Estate Owned - Reconciliation of Other Real Estate Owned (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Beginning Balance	$ 10,174	$ 11,313	$ 3,715
Additions	291	616	11,459
Valuation adjustments	(3,000)	(355)	(3,069)
Dispositions	(499)	(1,400)	(792)
Ending Balance	$ 6,966	$ 10,174	$ 11,313