Note 8 - Accumulated Other Comprehensive Income (Details) - The Balance of and Changes in Each Component of Accumulated Other Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013		Jun. 30, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss) December 31, 2012			$ 567
Net current-period other comprehensive income (loss)	(4,136)	421	(4,482)		477
Accumulated other comprehensive loss June 30, 2013	(3,915)		(3,915)
Gains (Losses) Effective Hedging [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss) December 31, 2012			(1,136)
Other comprehensive income (losses) before reclassifications			231
Amounts reclassified from other comprehensive income (loss) (1)			0	[1]
Net current-period other comprehensive income (loss)			231
Accumulated other comprehensive loss June 30, 2013	(905)		(905)
Unrealized Losses OTTI [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss) December 31, 2012			(1,017)
Other comprehensive income (losses) before reclassifications			(18)
Amounts reclassified from other comprehensive income (loss) (1)			0	[1]
Net current-period other comprehensive income (loss)			(18)
Accumulated other comprehensive loss June 30, 2013	(1,035)		(1,035)
Net Unrealized Investment Gain [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss) December 31, 2012			2,720
Other comprehensive income (losses) before reclassifications			(4,671)
Amounts reclassified from other comprehensive income (loss) (1)			(24)	[1]
Net current-period other comprehensive income (loss)			(4,695)
Accumulated other comprehensive loss June 30, 2013	(1,975)		(1,975)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss) December 31, 2012			567
Other comprehensive income (losses) before reclassifications			(4,458)
Amounts reclassified from other comprehensive income (loss) (1)			(24)	[1]
Net current-period other comprehensive income (loss)			(4,482)
Accumulated other comprehensive loss June 30, 2013	$ (3,915)		$ (3,915)

[1] Amounts reclassified from other comprehensive income were transferred to gain (loss) on securities, net.