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Note 8 - Reinsurance - Single Premium QSR Program (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 12 Months Ended | 15 Months Ended | 33 Months Ended | 36 Months Ended
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2017 | Jan. 31, 2020 | Oct. 31, 2017 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2013 | Dec. 31, 2015 | Dec. 31, 2017
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |
Ceded Premiums Written |  |  |  | $ 87,201 | $ 56,132 | $ 98,314 |  |  |
Radian Guaranty | 2020 Single Premium QSR Transaction |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |
Ceded Premiums Written |  | $ 250,000 |  |  |  |  |  |  |
Concentration Risk, Percentage |  | 65.00% |  |  |  |  |  |  |
Ceding commission for premium ceded |  | 25.00% |  |  |  |  |  |  |
RIF Ceded |  |  |  | 1,597,000 | 0 |  |  |  |
Radian Guaranty | 2020 Single Premium QSR Transaction | Maximum |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |
Loss Ratio |  | 56.00% |  |  |  |  |  |  |
Radian Guaranty | 2018 Single Premium QSR Transaction |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  | 65.00% |  |  |  |  |  |
Ceding commission for premium ceded |  |  | 25.00% |  |  |  |  |  |
RIF Ceded |  |  |  | $ 1,979,000 | 3,231,000 |  |  |  |
Radian Guaranty | 2018 Single Premium QSR Transaction | Maximum |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |
Loss Ratio |  |  | 56.00% |  |  |  |  |  |
Radian Guaranty | 2016 Single Premium QSR Transaction |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage | 65.00% |  |  |  |  |  | 20.00% | 35.00% | 35.00%
Ceding commission for premium ceded |  |  |  | 25.00% |  |  |  |  |
RIF Ceded |  |  |  | $ 3,071,000 | $ 5,351,000 |  |  |  |
Radian Guaranty | 2016 Single Premium QSR Transaction | Maximum |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |
Loss Ratio |  |  |  | 55.00% |  |  |  |  |

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