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Note 16 - Statutory Information Risk To Capital Calculation (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2018
USD ($)
state
Dec. 31, 2017
USD ($)
Risk to Capital Line Items [Line Items]    
Number Of States That Have A Statutory Or Regulatory Risk Based Capital Requirement | state 16  
Risk To Capital Ratio, Regulatory Maximum 25  
Radian Guaranty    
Risk to Capital Line Items [Line Items]    
Statutory Accounting Practices, Statutory Capital and Surplus, Increase (Decrease) $ 112.8  
RIF, net (1) [1] 37,571.1 $ 36,793.5
Common stock and paid-in capital 1,866.0 1,866.0
Surplus Notes 100.0 100.0
Unassigned earnings (deficit) (758.8) (765.0)
Statutory policyholders’ surplus 1,207.2 1,201.0
Contingency reserve 1,773.6 1,667.0
Statutory capital $ 2,980.8 $ 2,868.0
Risk-to-capital 12.6 12.8
Statutory Accounting Practices, Statutory Net Income Amount $ 111.9  
Non RBC States [Member] | Minimum [Member]    
Risk to Capital Line Items [Line Items]    
Capital Required for Capital Adequacy 1.0  
Non RBC States [Member] | Maximum [Member]    
Risk to Capital Line Items [Line Items]    
Capital Required for Capital Adequacy $ 5.0  
Reportable Subsegments [Member]    
Risk to Capital Line Items [Line Items]    
Risk-to-capital 11.9 12.1
[1] Excludes risk ceded through reinsurance contracts (to third parties and affiliates) and RIF on defaulted loans.