Note 5 - Investment Securities (Details) - Investment Securities by Contractual Maturity - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Investment Securities by Contractual Maturity [Abstract]
Due in 1 year or less	$ 23,526
Due in 1 year or less	24,035
Due in 1 year or less	1
Due in 1 year or less	1
After 1 year to 5 years	68,022
After 1 year to 5 years	67,445
After 1 year to 5 years	62,243
After 1 year to 5 years	62,778
After 5 years to 10 years	106,071
After 5 years to 10 years	105,624
After 5 years to 10 years	77,872
After 5 years to 10 years	78,740
After 10 years	12,159
After 10 years	12,015
After 10 years	0
After 10 years	0
Total	209,778
Total	209,119	$ 185,379
Total	140,116	67,866
Total	$ 141,519	$ 68,253