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Note 6 - Investments Investments In Any Person And Its Affiliates That Exceed 10% of Total Stockholders' Equity (Details) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014
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Debt Securities |  |
Investment Holdings [Line Items] |  |
Assets Held by Insurance Regulators | $ 10.4 | $ 12.1
Radian Guaranty Inc [Member] | 2013 Freddie Mac Agreement [Member] |  |
Investment Holdings [Line Items] |  |
Restricted Investments Held as Collateral for Master Transaction Agreement, Net | $ 74.7 | $ 209.3
Minimum [Member] |  |
Investment Holdings [Line Items] |  |
Investment as a Percentage of Total Stockholder's Equity | 10.00% |

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- Definition Investments restricted as to use but included in the marketable securities categories of an unclassified balance sheet, net of final loss mitigation activity. + References No definition available. + Details
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- Definition Carrying amount of cash and investment securities on deposit with state regulatory authorities in connection with capital requirements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 320 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=28366721&loc=d3e22002-158495 + Details
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