Note 2 - Segment Reporting Reconciliation of Net Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Net (loss) income:
Net (loss) income	$ 14,325	$ 183,568	$ (274,166)	$ 423,689
Mortgage Insurance Segment
Net (loss) income:
Net (loss) income	31,400	(42,191)	(36,833)	(375,804)
Financial Guaranty Segment
Net (loss) income:
Net (loss) income	$ (17,075)	$ 225,759	$ (237,333)	$ 799,493