Note 9 - Components of Accumulated Other Comprehensive Loss (Details) - Reclassifications Out of Accumulated Other Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Reclassifications out of unrealized gains and losses on available-for-sale securities:
Income taxes	$ (1)	$ (1)	$ (2)	$ (2)
Realized gains on available-for-sale securities, net of tax, reclassified out of accumulated other comprehensive income	(1)	(3)	(3)	(3)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassifications out of unrealized gains and losses on available-for-sale securities:
Realized securities gains, net	2	4	5	4
Income taxes	1	1	2	1
Realized gains on available-for-sale securities, net of tax, reclassified out of accumulated other comprehensive income	$ 1	$ 3	$ 3	$ 3