Note 14 - Statutory Information Risk To Capital Calculation (Details) (Radian Guaranty [Member], USD $) In Millions, unless otherwise specified	1 Months Ended
	Feb. 28, 2015	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Risk to Capital Line Items [Line Items]
Risk In Force		$ 30,615.7	[1]	$ 26,128.2	[1]
Statutory policyholders’ surplus		1,325.2		1,317.8		926.0
Contingency reserve		389.40		23.00		0
Statutory capital		1,714.6		1,340.8
Risk-to-capital		17.9		19.5
Subsequent Event [Member]
Risk to Capital Line Items [Line Items]
Statutory Accounting Practices, Capital Contributions Considered Under SAP 72	$ 100

[1] Excludes risk ceded through reinsurance contracts (to third parties and affiliates) and RIF on defaulted loans.