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Note 5 - Investments Schedule of Unrealized Losses (Details) $ in Thousands | Sep. 30, 2016 USD ($) security | Dec. 31, 2015 USD ($) security
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Continuous Loss Position Less Than Twelve Months [Abstract] |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | security | 75 | 305
Fair value available-for-sale securities | $ 241,430 | $ 1,462,577
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | $ 948 | $ 32,079
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | security | 39 | 23
Fair value available-for-sale securities | $ 101,481 | $ 54,203
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 1,184 | $ 2,221
Continuous Loss Position, Total |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 114 | 328
Fair value available-for-sale securities | $ 342,911 | $ 1,516,780
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 2,132 | $ 34,300
US government and agency securities |  |
Continuous Loss Position Less Than Twelve Months [Abstract] |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | security | 4 | 1
Fair value available-for-sale securities | $ 3,536 | $ 5,752
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | $ 24 | $ 21
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | security | 0 | 0
Fair value available-for-sale securities | $ 0 | $ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 0 | $ 0
Continuous Loss Position, Total |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 4 | 1
Fair value available-for-sale securities | $ 3,536 | $ 5,752
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 24 | $ 21
US States and Political Subdivisions Debt Securities [Member] |  |
Continuous Loss Position Less Than Twelve Months [Abstract] |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | security |  | 2
Fair value available-for-sale securities |  | $ 11,674
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss |  | $ 120
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | security |  | 0
Fair value available-for-sale securities |  | $ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | $ 0
Continuous Loss Position, Total |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security |  | 2
Fair value available-for-sale securities |  | $ 11,674
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | $ 120
Corporate bonds and notes |  |
Continuous Loss Position Less Than Twelve Months [Abstract] |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | security | 14 | 117
Fair value available-for-sale securities | $ 29,166 | $ 510,807
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | $ 115 | $ 16,773
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | security | 6 | 6
Fair value available-for-sale securities | $ 18,271 | $ 8,700
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 276 | $ 518
Continuous Loss Position, Total |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 20 | 123
Fair value available-for-sale securities | $ 47,437 | $ 519,507
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 391 | $ 17,291
RMBS |  |
Continuous Loss Position Less Than Twelve Months [Abstract] |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | security | 9 | 12
Fair value available-for-sale securities | $ 92,845 | $ 168,415
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | $ 220 | $ 2,464
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | security | 0 | 0
Fair value available-for-sale securities | $ 0 | $ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 0 | $ 0
Continuous Loss Position, Total |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 9 | 12
Fair value available-for-sale securities | $ 92,845 | $ 168,415
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 220 | $ 2,464
CMBS |  |
Continuous Loss Position Less Than Twelve Months [Abstract] |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | security | 19 | 58
Fair value available-for-sale securities | $ 54,676 | $ 387,268
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | $ 442 | $ 8,939
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | security | 0 | 0
Fair value available-for-sale securities | $ 0 | $ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 0 | $ 0
Continuous Loss Position, Total |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 19 | 58
Fair value available-for-sale securities | $ 54,676 | $ 387,268
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 442 | $ 8,939
Other ABS |  |
Continuous Loss Position Less Than Twelve Months [Abstract] |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | security | 28 | 96
Fair value available-for-sale securities | $ 60,953 | $ 284,998
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | $ 147 | $ 2,559
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | security | 30 | 14
Fair value available-for-sale securities | $ 79,609 | $ 43,225
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 857 | $ 1,415
Continuous Loss Position, Total |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 58 | 110
Fair value available-for-sale securities | $ 140,562 | $ 328,223
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 1,004 | $ 3,974
Foreign government securities |  |
Continuous Loss Position Less Than Twelve Months [Abstract] |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | security | 1 | 18
Fair value available-for-sale securities | $ 254 | $ 18,733
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | $ 0 | $ 1,095
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | security | 3 | 3
Fair value available-for-sale securities | $ 3,601 | $ 2,278
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 51 | $ 288
Continuous Loss Position, Total |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 4 | 21
Fair value available-for-sale securities | $ 3,855 | $ 21,011
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 51 | $ 1,383
Equity securities |  |
Continuous Loss Position Less Than Twelve Months [Abstract] |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | security |  | 1
Fair value available-for-sale securities |  | $ 74,930
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss |  | $ 108
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | security |  | 0
Fair value available-for-sale securities |  | $ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | $ 0
Continuous Loss Position, Total |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security |  | 1
Fair value available-for-sale securities |  | $ 74,930
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | $ 108

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