Note 6 - Other Comprehensive Income (Loss) (Details) - Components of Other Comprehensive Income (Loss) and Related Tax Effects - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Components of Other Comprehensive Income (Loss) and Related Tax Effects [Abstract]
Net unrealized gains (losses) arising during the period	$ 458	$ (234)	$ 798	$ 317
Net unrealized gains (losses) arising during the period	183	(164)	317	15
Net unrealized gains (losses) arising during the period	275	(70)	481	302
Other comprehensive income (loss)	458	(234)	798	317
Other comprehensive income (loss)	183	(164)	317	15
Other comprehensive income (loss)	$ 275	$ (70)	$ 481	$ 302