Note 15 - Commitments and Contingencies Legal Proceedings (Details) (USD $)							3 Months Ended		1 Months Ended	84 Months Ended
	Aug. 13, 2010 Loss Contingency 8_13_2010 Claim [Member] policy loan	Aug. 01, 2011 Loss Contingency 8_1_2011 Claim [Member] loan	Oct. 09, 2012 Real Estate Settlement Practices Act of 1974 [Member] borrower	Sep. 28, 2012 Real Estate Settlement Practices Act of 1974 [Member] borrower	May 18, 2012 Real Estate Settlement Practices Act of 1974 [Member] plaintiff	Dec. 30, 2011 Real Estate Settlement Practices Act of 1974 [Member] plaintiff	Mar. 31, 2013 Total Primary Insurance Mortgage Insurance Products [Member] Minimum [Member] Loss Contingency Related to Primary Insurance [Member]	Mar. 31, 2013 Pool Insurance Mortgage Insurance Product [Member] Maximum [Member] Loss Contingency Related to Primary Insurance [Member]	Apr. 30, 2013 Consumer Financial Protection Bureau Settlement [Member] Real Estate Settlement Practices Act of 1974 [Member]	Dec. 31, 2012 Captive Reinsurance Arrangements [Member]
Settled Law Suits [Abstract]
Litigation Settlement, Gross									$ 3,750,000
Loss Contingency, Settlement Agreement, Number of Years Restricted From Activities									10 years
Net Cash Received (Paid) For Commutations, Terminations And Recaptures										750,000,000
Pending Law Suits [Abstract]
Number Of RMBS Bulk Primary Mortgage Insurance Policies Involved In Pending or Threatened Litigation	27
Number Of Loans Included In The RMBS Bulk Primary Mortgage Insurance Policies Involved In Litigation	680
Risk In Force	$ 20,000,000	$ 13,000,000
Number Of Home Mortgage Loans Involved In Pending Litigation		220
Loss Contingency, Number of Additional Borrowers with Loss Contingency			1	3
Loss Contingency, Number of Plaintiffs Whose Loans Were Insured					1	1
Loss Reserve Information [Abstract]
Loss Contingency, Legal Actions Commencement, Period							2 years	3 years