Note 15 - Commitments and Contingencies Contingent Claims for Trade Credit and Surety Primary Insurers (Details) (Trade Credit Reinsurance and Surety Insurance [Member]) In Millions, unless otherwise specified	Mar. 31, 2015 Financial Guaranty Segment servicers	Dec. 31, 2014 Radian Asset Assurance [Member] Euro Member Countries, Euro EUR (€)	Dec. 31, 2014 Radian Asset Assurance [Member] United States of America, Dollars USD ($)
Loss Contingencies [Line Items]
Loss Contingency, Claims Received Through Reporting Period		€ 13.5	$ 16.4
Number of Servicers Who Have Submitted Claims	1