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Note 8 - Reinsurance Reinsurance Transaction Details (Details)
$ in Thousands
 1 Months Ended 12 Months Ended 15 Months Ended 24 Months Ended 33 Months Ended 36 Months Ended
Dec. 31, 2017
USD ($)
group
Oct. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
group
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Mar. 31, 2013
Dec. 31, 2017
USD ($)
group
Dec. 31, 2015
USD ($)
Dec. 31, 2017
USD ($)
group
Ceded Credit Risk [Line Items]                  
Ceded Premiums Earned     $ 57,271 $ 77,359 $ 57,780        
2018 Single Premium QSR [Member]                  
Ceded Credit Risk [Line Items]                  
Percentage of NIW Able to be Ceded Under QSA   65.00%              
Ceded Insurance Commission Percentage   25.00%              
Ceded Premiums Written   $ 335,000              
Number of GSEs | group 1   1       1   1
2018 Single Premium QSR [Member] | Maximum [Member]                  
Ceded Credit Risk [Line Items]                  
Loss Ratio   56.00%              
Radian Guaranty [Member] | Single Premium QSR Transaction [Member] | Reinsurer Concentration Risk [Member]                  
Ceded Credit Risk [Line Items]                  
Ceded Insurance Commission Percentage     25.00%            
Concentration Risk, Percentage 65.00%         20.00% 35.00% 35.00% 35.00%
Ceded Premiums Written     $ 193,517 [1] 233,206 [1] 0 [2]        
Risk In Force $ 6,900,000   6,900,000 3,800,000     $ 6,900,000   $ 6,900,000
Ceded Premiums Earned     27,284 [1] 29,808 [1] 0 [2]        
Ceding Commissions Written     55,333 66,153 0        
Fees and Commissions [3]     13,774 15,303 0        
Radian Guaranty [Member] | Single Premium QSR Transaction [Member] | Reinsurer Concentration Risk [Member] | First Lien Mortgage Insurance Products [Member]                  
Ceded Credit Risk [Line Items]                  
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments 2,490   $ 2,490 2,262 0   2,490 $ 0 2,490
Radian Guaranty [Member] | Single Premium QSR Transaction [Member] | Reinsurer Concentration Risk [Member] | Maximum [Member]                  
Ceded Credit Risk [Line Items]                  
Ceded Premiums Written             195,000    
Loss Ratio     55.00%            
Radian Guaranty [Member] | Quota Share Reinsurance Transactions [Member] | Reinsurer Concentration Risk [Member] | First Lien Mortgage Insurance Products [Member]                  
Ceded Credit Risk [Line Items]                  
Ceded Premiums Written [1]     $ 19,356 28,097 30,213        
Ceded Premiums Earned [1]     28,503 42,515 46,975        
Ceding Commissions Written     5,536 8,019 11,443        
Fees and Commissions [3]     13,122 16,573 14,453        
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments 771   771 1,858 1,187   771 1,187 771
First Lien Mortgage Insurance Products [Member] | Radian Guaranty [Member] | Quota Share Reinsurance Transactions [Member] | Reinsurer Concentration Risk [Member]                  
Ceded Credit Risk [Line Items]                  
Risk In Force $ 1,200,000   $ 1,200,000 $ 1,600,000 $ 2,100,000   $ 1,200,000 $ 2,100,000 $ 1,200,000
[1] Net of profit commission.
[2] Net of profit commission.
[3] Includes amounts reported in policy acquisition costs and other operating expenses.