Note 2 - Investment Securities (Details) - Available-for-sale Securities by Contractual Maturity - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Available-for-sale Securities by Contractual Maturity [Abstract]
One year or less	$ 2
One year or less	2
Over one through five years	1,963
Over one through five years	1,993
Over five through ten years	10,708
Over five through ten years	10,771
Greater than 10 years	41,204
Greater than 10 years	41,991
	53,877	$ 51,944
	$ 54,757	$ 52,544