Note 19 - Fair Value Measurements - Fair Value Adjustments for Assets Measured On a Nonrecurring Basis (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Fair value adjustments	$ 983	$ 1,492
Impaired Loans [Member]
Fair value adjustments	386	858
OREO [Member]
Fair value adjustments	$ 597	$ 634