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		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013		Sep. 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)	(551)	611	(5,033)		1,088
Accumulated other comprehensive loss September 30, 2013	(4,466)		(4,466)
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			287
Amounts reclassified from other comprehensive income (loss) (1)			0	[1]
Net current-period other comprehensive income (loss)			287
Accumulated other comprehensive loss September 30, 2013	(849)		(849)
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			(34)
Amounts reclassified from other comprehensive income (loss) (1)			0	[1]
Net current-period other comprehensive income (loss)			(34)
Accumulated other comprehensive loss September 30, 2013	(1,051)		(1,051)
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			(5,265)
Amounts reclassified from other comprehensive income (loss) (1)			(21)	[1]
Net current-period other comprehensive income (loss)			(5,286)
Accumulated other comprehensive loss September 30, 2013	(2,566)		(2,566)
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			(5,012)
Amounts reclassified from other comprehensive income (loss) (1)			(21)	[1]
Net current-period other comprehensive income (loss)			(5,033)
Accumulated other comprehensive loss September 30, 2013	$ (4,466)		$ (4,466)

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