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Note 7 - Reinsurance Reinsurance Transactions (Details) - Reinsurer Concentration Risk [Member] - Radian Guaranty - USD ($) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 36 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 31, 2017 | Oct. 31, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
2016 Single Premium QSR Program |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |
Percent of Ceded Risk |  |  |  |  |  |  |  | 35.00%
Risk In Force |  |  |  | $ 6,400,000 | $ 4,300,000 | $ 6,400,000 | $ 4,300,000 |
2018 Single Premium QSR Program |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |
Percent of Ceded Risk |  | 65.00% |  |  |  |  |  |
Risk In Force |  |  |  | 1,600,000 |  | 1,600,000 |  |
Ceded Premiums Written |  |  | $ 335,000 |  |  |  |  |
Single Premium QSR Program |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |
Ceded Premiums Written | [1] |  |  | 20,920 | 13,248 | 64,818 | 36,064 |
Ceded Premiums Earned | [1] |  |  | 11,181 | 6,771 | 32,718 | 18,941 |
Ceding commissions written |  |  |  | 8,070 | 5,156 | 24,571 | 14,002 |
Ceding Commissions Earned | [2] |  |  | 5,635 | 3,536 | 16,546 | 9,721 |
Ceded losses |  |  |  | 1,060 | 406 | 2,973 | 1,443 |
QSR Program |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |
Ceded Premiums Written | [1] |  |  | 3,174 | 4,621 | 10,621 | 15,137 |
Ceded Premiums Earned | [1] |  |  | 4,632 | 6,826 | 15,502 | 22,064 |
Ceding commissions written |  |  |  | 918 | 1,323 | 3,058 | 4,328 |
Ceding Commissions Earned | [2] |  |  | 2,738 | 2,925 | 9,182 | 10,198 |
Ceded losses |  |  |  | 131 | 257 | 383 | 517 |
First Lien Mortgage Insurance Products [Member] | QSR Program |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |
Risk In Force |  |  |  | $ 1,000,000 | $ 1,300,000 | $ 1,000,000 | $ 1,300,000 |
[1] | Net of profit commission.
[2] | Includes amounts reported in policy acquisition costs and other operating expenses.

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