Note 5 - Investment Securities (Details) - Investment Securities by Contractual Maturity - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Investment Securities by Contractual Maturity [Abstract]
Due in 1 year or less	$ 21,008
Due in 1 year or less	21,325
Due in 1 year or less	0
Due in 1 year or less	0
After 1 year to 5 years	60,626
After 1 year to 5 years	60,142
After 1 year to 5 years	67,529
After 1 year to 5 years	67,460
After 5 years to 10 years	81,196
After 5 years to 10 years	80,585
After 5 years to 10 years	51,809
After 5 years to 10 years	51,809
After 10 years	14,397
After 10 years	14,090
After 10 years	0
After 10 years	0
Total	177,227
Total	176,142	$ 185,379
Total	119,338	67,866
Total	$ 119,269	$ 68,253