Note 2 - Investment Securities (Details) - Amortized Cost and Fair Value of Investment Securities by Contractual Maturity - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Amortized Cost and Fair Value of Investment Securities by Contractual Maturity [Abstract]
Due In One Year or Less	$ 331
Due In One Year or Less	333
Due In One Year or Less	28
Due In One Year or Less	28
Due After One Year Through Five Years	784
Due After One Year Through Five Years	790
Due After One Year Through Five Years	0
Due After One Year Through Five Years	0
Due After Five Years Through Ten Years	1,595
Due After Five Years Through Ten Years	1,624
Due After Five Years Through Ten Years	0
Due After Five Years Through Ten Years	0
Due After Ten Years	1,497
Due After Ten Years	1,484
Due After Ten Years	0
Due After Ten Years	0
	4,207
	4,231
	28
	28
Mortgage-Backed Securities	271,010
Mortgage-Backed Securities	267,380
Mortgage-Backed Securities	0
Mortgage-Backed Securities	0
	275,217
	271,611
	28	$ 30
	$ 28	$ 30