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Note 5 - Investments Unrealized Gain (Loss) on Investments (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
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Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis | $ 3,129,901 |  | $ 2,856,468 |
Available-for-sale Securities, Debt Securities | 3,158,843 |  | 2,838,512 |
Available-for-sale Equity Securities, Amortized Cost Basis | 176,930 |  | 1,330 |
Available-for-sale Securities, Equity Securities | 176,808 |  | 1,330 |
Amortized Cost Debt and Equity Securities | 3,306,831 |  | 2,857,798 |
Available-for-sale Securities | 3,335,651 |  | 2,839,842 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 42,490 |  | 20,827 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 13,670 |  | 38,783 |
US government and agency securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 58,706 |  | 78,931 |
Available-for-sale Securities, Debt Securities | 58,343 |  | 75,474 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 201 |  | 2 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | 564 |  | 3,459 |
US States and Political Subdivisions Debt Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 111,858 |  | 66,124 |
Available-for-sale Securities, Debt Securities | 115,454 |  | 67,171 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 3,936 |  | 1,868 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | 340 |  | 821 |
Corporate bonds and notes |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 1,713,237 |  | 1,463,720 |
Available-for-sale Securities, Debt Securities | 1,735,846 |  | 1,455,628 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 30,429 |  | 14,320 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | 7,820 |  | 22,412 |
RMBS |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 184,603 |  | 358,262 |
Available-for-sale Securities, Debt Securities | 182,716 |  | 350,628 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 921 |  | 197 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | 2,808 |  | 7,831 |
CMBS |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 432,124 |  | 429,057 |
Available-for-sale Securities, Debt Securities | 435,101 |  | 428,289 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 4,075 |  | 2,255 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | 1,098 |  | 3,023 |
Other ABS |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 596,416 |  | 433,603 |
Available-for-sale Securities, Debt Securities | 597,864 |  | 434,728 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 2,023 |  | 2,037 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | 575 |  | 912 |
Foreign government securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 31,457 |  | 24,771 |
Available-for-sale Securities, Debt Securities | 32,019 |  | 24,594 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 589 |  | 148 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | 27 |  | 325 |
Other than Securities Investment [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 1,500 |  | 2,000 |
Available-for-sale Securities, Debt Securities | 1,500 |  | 2,000 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 0 |  | 0 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | 0 |  | 0 |
Debt Securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 3,129,901 |  | 2,856,468 |
Available-for-sale Securities, Debt Securities | 3,158,843 |  | 2,838,512 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 42,174 |  | 20,827 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | 13,232 |  | 38,783 |
Equity securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Equity Securities, Amortized Cost Basis | 176,930 | [1] | 1,330 | [2]
Available-for-sale Securities, Equity Securities | 176,808 | [1] | 1,330 | [2]
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax | 316 | [1] | 0 | [2]
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax | $ 438 | [1] | $ 0 | [2]
[1] | Primarily consists of investments in fixed income and equity exchange-traded funds and publicly-traded business development company equities.
[2] | Primarily consists of investments in Federal Home Loan Bank stock as required in connection with the memberships of Radian Guaranty and Radian Reinsurance in the FHLB.

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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