Note 2 - Investment Securities (Details) - Amortized Cost and Fair Value of Investment Securities by Contractual Maturity - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Amortized Cost and Fair Value of Investment Securities by Contractual Maturity [Abstract]
Due In One Year or Less	$ 0
Due In One Year or Less	0
Due In One Year or Less	27
Due In One Year or Less	27
Due After One Year Through Five Years	1,118
Due After One Year Through Five Years	1,125
Due After One Year Through Five Years	0
Due After One Year Through Five Years	0
Due After Five Years Through Ten Years	1,606
Due After Five Years Through Ten Years	1,621
Due After Five Years Through Ten Years	0
Due After Five Years Through Ten Years	0
Due After Ten Years	1,179
Due After Ten Years	1,149
Due After Ten Years	0
Due After Ten Years	0
	3,903
	3,895
	27
	27
Mortgage-Backed Securities	276,068
Mortgage-Backed Securities	269,983
Mortgage-Backed Securities	0
Mortgage-Backed Securities	0
	279,971
	273,878
	27	$ 30
	$ 27	$ 30