Note 9 - Components of Accumulated Other Comprehensive Loss (Details) - Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Reclassifications out of unrealized gains and losses on available-for-sale securities:
Income tax expense	$ 1	$ 0
Realized gains (losses) on available-for-sale securities, net of tax, reclassified out of accumulated other comprehensive income	(1)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassifications out of unrealized gains and losses on available-for-sale securities:
Realized securities gains (losses), net	(2)
Income tax expense	1
Realized gains (losses) on available-for-sale securities, net of tax, reclassified out of accumulated other comprehensive income	$ (1)