Note 17 - Commitments and Contingencies Legal Proceedings (Details) $ in Millions	1 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2015 USD ($) plaintiff matters loan
Loss Reserve Information [Abstract]
Minimum Number of Pending or Threatened Matters That Could Effect Our Results | matters		1
Settlement Agreement, Number of Years Entity Has Agreed Not to Enter Into Captive Insurance Arrangements	10 years
Internal Revenue Service (IRS) [Member]
Loss Reserve Information [Abstract]
Income Tax Examination, Amount of Claimed Income Tax Refund Being Disallowed for Tax Years 2006 and 2007		$ 105
Minimum [Member]
Loss Contingencies [Line Items]
Number Of Home Mortgage Loans Involved In Pending Litigation | loan		1
Loss Reserve Information [Abstract]
Loss Contingency, Number of Plaintiffs | plaintiff		1
REMIC Residual [Member] | Internal Revenue Service (IRS) [Member]
Loss Contingencies [Line Items]
Income Tax Examination, Notice of Deficiency, Amounts Related to Unpaid Taxes and Penalties		$ 157
Loss Reserve Information [Abstract]
Income Tax Examination, Estimated Interest on Notice of Deficiency Amounts		125
Income Tax Examination, Proposed State Liabilities Resulting from IRS Examination of Tax Years 2000 Through 2007		$ 32
Insurance Claims [Member] | Maximum [Member] | Total Primary Insurance Mortgage Insurance Products [Member]
Loss Reserve Information [Abstract]
Loss Contingency, Legal Actions Commencement, Period		2 years
Insurance Claims [Member] | Maximum [Member] | Pool Insurance Mortgage Insurance Product [Member]
Loss Reserve Information [Abstract]
Loss Contingency, Legal Actions Commencement, Period		3 years