Note 9 - Components of Accumulated Other Comprehensive Loss (Details) - Reclassifications Out of Accumulated Other Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Reclassifications out of unrealized gains and losses on available-for-sale securities:
Income taxes	$ 2	$ 0	$ (1)	$ 0
Realized gains on available-for-sale securities, net of tax, reclassified out of accumulated other comprehensive income	(3)		(2)	(1)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassifications out of unrealized gains and losses on available-for-sale securities:
Realized securities gains, net	(5)		(3)	(1)
Income taxes	(2)		(1)
Realized gains on available-for-sale securities, net of tax, reclassified out of accumulated other comprehensive income	$ (3)		$ (2)	$ (1)