Note 9 - Derivatives (Detail) - Derivatives Information (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013		Dec. 31, 2012
Notional Amount	$ 605,000		$ 455,000
Assets at Fair Value	7,666	[1]	4,940	[1]
Liabilities at Fair Value	(597)	[1]	(365)	[1]
Interest Rate Swap [Member]
Notional Amount	475,000		325,000
Assets at Fair Value	2,792	[1]	395	[1]
Liabilities at Fair Value	(597)	[1]	(365)	[1]
Swaption [Member]
Notional Amount	130,000		130,000
Assets at Fair Value	4,874	[1]	4,545	[1]
Liabilities at Fair Value		[1]		[1]

[1] See Note 7, "Fair Value of Financial Instruments" for additional discussion.