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Note 1 - Condensed Consolidated Financial Statements - Business Overview and Significant Accounting Policies Business Overview and Significant Accounting Policies(Details) $ in Thousands, shares in Millions |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jan. 27, 2017 USD ($) shares | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) segment | Jun. 30, 2016 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Business Overview [Abstract] |  |  |  |  |  |  |  |
Number of Operating Segments | segment |  |  |  |  | 2 |  |  |
Mortgage Insurance [Abstract] |  |  |  |  |  |  |  |
Loss on induced conversion and debt extinguishment |  | $ (1,247) |  | $ (2,108) | $ (5,703) | $ (57,678) |  |
Impairment of goodwill (Note 6) |  | 184,374 |  | $ 0 | 184,374 | $ 0 |  |
Finite-Lived Intangible Assets, Net |  | $ 58,935 |  |  | $ 58,935 |  |  |
Mortgage Insurance Segment |  |  |  |  |  |  |  |
Mortgage Insurance [Abstract] |  |  |  |  |  |  |  |
Private Mortgage Insurance Protects Lenders For Loans Made With Less Than This Maximum Down Payment Percentage |  | 20.00% |  |  | 20.00% |  |  |
Risk In Force |  | $ 49,800,000 |  |  | $ 49,800,000 |  |  |
Mortgage and Real Estate Services Segment [Member] |  |  |  |  |  |  |  |
Mortgage Insurance [Abstract] |  |  |  |  |  |  |  |
Impairment of goodwill (Note 6) |  | 184,374 |  |  | 184,374 |  | $ 0 |
Impairment of Intangible Assets, Finite-lived |  | 15,800 |  |  |  |  |  |
Goodwill |  | 10,922 |  |  | 10,922 |  | 195,170 | $ 195,170
Finite-Lived Intangible Assets, Net |  | 58,935 |  |  | 58,935 |  | $ 81,058 |
Convertible Senior Notes Due 2017 |  |  |  |  |  |  |  |
Mortgage Insurance [Abstract] |  |  |  |  |  |  |  |
Repayments of Convertible Debt |  | 31,600 |  |  |  |  |  |
Convertible Senior Notes Due 2019 |  |  |  |  |  |  |  |
Mortgage Insurance [Abstract] |  |  |  |  |  |  |  |
Debt Instrument, Repurchase Amount |  |  | $ 68,000 |  |  |  |  |
Repayments of Convertible Debt | $ 110,100 |  |  |  |  |  |  |
Loss on induced conversion and debt extinguishment | $ (4,500) |  | $ (4,500) |  |  |  |  |
Convertible Debt | Convertible Senior Notes Due 2017 |  |  |  |  |  |  |  |
Mortgage Insurance [Abstract] |  |  |  |  |  |  |  |
Debt Instrument, Repurchase Amount |  | 21,600 |  |  | $ 21,600 |  |  |
Loss on induced conversion and debt extinguishment |  | $ (1,200) |  |  |  |  |  |
Convertible Debt | Convertible Senior Notes Due 2019 |  |  |  |  |  |  |  |
Mortgage Insurance [Abstract] |  |  |  |  |  |  |  |
Reduction in Dilutive Shares Attributable to Redemption of Conversion of Debt Securities | shares | 6.4 |  |  |  |  |  |  |
Total Primary Insurance Mortgage Insurance Products [Member] | Mortgage Insurance Segment |  |  |  |  |  |  |  |
Mortgage Insurance [Abstract] |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  | 98.20% |  |  |
Pool Insurance Mortgage Insurance Product [Member] | Mortgage Insurance Segment |  |  |  |  |  |  |  |
Mortgage Insurance [Abstract] |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  | 1.70% |  |  |

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