Note 15 - Commitments and Contingencies Legal Proceedings (Details) (USD $)				0 Months Ended						84 Months Ended		9 Months Ended
	Sep. 13, 2013 Loss Contingency 8_13_2010 Claim [Member] loan	Aug. 13, 2010 Loss Contingency 8_13_2010 Claim [Member] policy	Aug. 01, 2011 Loss Contingency 8_1_2011 Claim [Member] loan	Apr. 09, 2013 Real Estate Settlement Practices Act of 1974 [Member]	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	Jan. 13, 2012 Real Estate Settlement Practices Act of 1974 [Member] plaintiff	Dec. 30, 2011 Real Estate Settlement Practices Act of 1974 [Member] plaintiff	Dec. 31, 2012 Captive Reinsurance Arrangements [Member]	Sep. 30, 2013 Internal Revenue Service (IRS) [Member]	Sep. 30, 2013 Total Primary Insurance Mortgage Insurance Products [Member] Maximum [Member] Loss Contingency Related to Primary Insurance [Member]	Sep. 30, 2013 Pool Insurance Mortgage Insurance Product [Member] Maximum [Member] Loss Contingency Related to Primary Insurance [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
Number of Days Company Has to Respond to IRS Office of Appeals Deficiency Notice											90 days
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
Litigation Settlement, Amount of Risk in Force to Be Reinstated	19,000,000
Risk In Force			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	1
Loss Reserve Information [Abstract]
Loss Contingency, Legal Actions Commencement, Period												2 years	3 years
Proposed Increase To Tax Liability Resulting From I.R.S. Examination Of Tax Years 2000 Through 2007											128,000,000
Income Tax Examination, Proposed Penalties											$ 42,000,000