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Note 7 - Reinsurance Reinsurance Transactions (Details) - Reinsurer Concentration Risk [Member] - Radian Guaranty $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended | 15 Months Ended | 24 Months Ended | 33 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Dec. 31, 2015 | Mar. 31, 2013 | Dec. 31, 2017 USD ($) | Dec. 31, 2015 | Dec. 31, 2012 transaction
Quota Share Reinsurance Transactions [Member] |  |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |
Number of Quota Share Reinsurance Agreements | transaction |  |  |  |  |  |  |  |  |  | 2
Ceded Insurance Commission Percentage |  |  |  | 30.00% |  | 35.00% |  |  |  |
Ceded Premiums Written | [1] | $ 6,730 | $ 8,466 | $ 22,048 | $ 23,279 |  |  |  |  |
Ceded Premiums Earned | [1] | 10,597 | 12,203 | 33,094 | 36,452 |  |  |  |  |
Accrued Liabilities for Commissions, Expense and Taxes |  | 1,922 | 2,743 | 6,291 | 8,890 |  |  |  |  |
Fees and Commissions | [2] | $ 3,974 | 2,463 | 12,199 | 10,987 |  |  |  |  |
Single Premium QSR Transaction [Member] |  |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |
Ceded Insurance Commission Percentage |  | 25.00% |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  | 20.00% |  | 35.00% |
Ceded Premiums Written | [1] | $ 13,004 |  | 222,085 |  |  |  |  |  |
Ceded Premiums Earned | [1] | 8,608 |  | 21,748 |  |  |  |  |  |
Accrued Liabilities for Commissions, Expense and Taxes |  | 5,482 |  | 61,258 |  |  |  |  |  |
Fees and Commissions | [2] | $ 4,382 |  | 11,173 |  |  |  |  |  |
Scenario, Forecast [Member] | Single Premium QSR Transaction [Member] |  |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  | 35.00% |  |
Maximum [Member] | Single Premium QSR Transaction [Member] |  |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |
Loss Ratio |  | 55.00% |  |  |  |  |  |  |  |
Maximum [Member] | Scenario, Forecast [Member] | Single Premium QSR Transaction [Member] |  |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |
Ceded Premiums Written |  |  |  |  |  |  |  | $ 195,000 |  |
First Lien Mortgage Insurance Products [Member] | Quota Share Reinsurance Transactions [Member] |  |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |
Risk In Force |  | $ 1,700,000 | $ 2,300,000 | 1,700,000 | $ 2,300,000 |  |  |  |  |
First Lien Mortgage Insurance Products [Member] | Single Premium QSR Transaction [Member] |  |  |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |  |  |
Risk In Force |  | $ 3,600,000 |  | $ 3,600,000 |  |  |  |  |  |
[1] | Net of profit commission.
[2] | Includes amounts reported in policy acquisition costs and other operating expenses.

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- Definition Percentage of commissions due to ceded insurance. + References No definition available. + Details
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- Definition Amount of contractual commission based on ceded premiums written for the period. + References No definition available. + Details
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- Definition This concept represents the number of quota share reinsurance agreements the company has entered into with third party reinsurance providers. + References No definition available. + Details
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- Definition Amount of earned premiums ceded to other entities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.1) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (b),(c)(2) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6486662&loc=d3e27175-158546 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574992-122915 + Details
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- Definition Amount of written premiums ceded to other entities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + Details
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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13531-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6404-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13537-108611 + Details
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- Definition Amount of fees and commissions from financial services and banking activities and correspondent clearing. Includes fees from depositor accounts, credit cards, merchant discounts, and fiduciary and trust activities, guarantee fees, investment advisory, management, and administrative fees, transfer agent fees, and insurance commissions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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