Note 15 - Balance Sheet Offsetting (Detail) - Financial Instruments that are Eligible for Offset in the Consolidated Balance Sheet (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Gross Amounts of Recognized Liabilities	$ 1,150,000	$ 1,250,000	$ 1,250,000
Gross Amounts Offset in the Statement of Financial Position	0	0
Financial Instruments	0	0
Collateral Posted	(1,150,000)	(1,250,000)
Net Amount	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	$ 1,150,000	$ 1,250,000