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Note 8 - Reinsurance QSR 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 ($) | Jan. 31, 2020 USD ($) group | Oct. 31, 2017 | Dec. 31, 2019 USD ($) group | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Mar. 31, 2013 | Dec. 31, 2017 USD ($) | Dec. 31, 2015 | Dec. 31, 2017 USD ($)
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ceded Premiums Written | [1] |  |  |  | $ 56,132 | $ 98,314 | $ 214,343 |  |  |  |
Radian Guaranty | QSR Program |  |  |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
RIF Ceded |  | $ 1,200,000 |  |  | 600,000 | 900,000 | 1,200,000 |  | $ 1,200,000 |  | $ 1,200,000
Radian Guaranty | 2016 Single Premium QSR Transaction |  |  |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
RIF Ceded |  | $ 6,900,000 |  |  | $ 5,400,000 | 6,300,000 | $ 6,900,000 |  | $ 6,900,000 |  | $ 6,900,000
Concentration Risk, Percentage |  | 65.00% |  |  |  |  |  | 20.00% | 35.00% | 35.00% | 35.00%
Ceding commission for premium ceded |  |  |  |  | 25.00% |  |  |  |  |  |
Radian Guaranty | 2016 Single Premium QSR Transaction | Maximum |  |  |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loss Ratio |  |  |  |  | 55.00% |  |  |  |  |  |
Radian Guaranty | 2018 Single Premium QSR Transaction |  |  |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
RIF Ceded |  |  |  |  | $ 3,200,000 | $ 1,900,000 |  |  |  |  |
Ceding commission for premium ceded |  |  |  | 25.00% |  |  |  |  |  |  |
Number of GSEs | group |  |  |  |  | 1 |  |  |  |  |  |
Percentage of NIW Able to be Ceded Under QSA |  |  |  | 65.00% |  |  |  |  |  |  |
Radian Guaranty | 2018 Single Premium QSR Transaction | Maximum |  |  |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loss Ratio |  |  |  | 56.00% |  |  |  |  |  |  |
Subsequent Event | Radian Guaranty | 2020 Single Premium QSR Transaction |  |  |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ceding commission for premium ceded |  |  | 25.00% |  |  |  |  |  |  |  |
Number of GSEs | group |  |  | 1 |  |  |  |  |  |  |  |
Percentage of NIW Able to be Ceded Under QSA |  |  | 65.00% |  |  |  |  |  |  |  |
Ceded Premiums Written |  |  | $ 250,000 |  |  |  |  |  |  |  |
Subsequent Event | Radian Guaranty | 2020 Single Premium QSR Transaction | Maximum |  |  |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loss Ratio |  |  | 56.00% |  |  |  |  |  |  |  |
[1] | Net of profit commission.

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