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Note 5 - Investments Schedule of Unrealized Losses (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 USD ($) security | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) security | Jun. 30, 2016 USD ($) | Dec. 31, 2016 USD ($) security
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Other than Temporary Impairment Losses, Investments | $ 1,000 | $ 0 | $ 1,000 | $ 0 |
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 | 311 |  | 311 |  | 362
Fair value available-for-sale securities | $ 1,139,971 |  | $ 1,139,971 |  | $ 1,566,440
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 13,490 |  | $ 13,490 |  | $ 37,941
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 | 5 |  | 5 |  | 21
Fair value available-for-sale securities | $ 11,303 |  | $ 11,303 |  | $ 58,451
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 180 |  | $ 180 |  | $ 842
Continuous Loss Position, Total |  |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 316 |  | 316 |  | 383
Fair value available-for-sale securities | $ 1,151,274 |  | $ 1,151,274 |  | $ 1,624,891
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 13,670 |  | $ 13,670 |  | $ 38,783
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 | 7 |  | 7 |  | 7
Fair value available-for-sale securities | $ 36,682 |  | $ 36,682 |  | $ 73,160
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 564 |  | $ 564 |  | $ 3,459
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 |  | 0
Fair value available-for-sale securities | $ 0 |  | $ 0 |  | $ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 0 |  | $ 0 |  | $ 0
Continuous Loss Position, Total |  |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 7 |  | 7 |  | 7
Fair value available-for-sale securities | $ 36,682 |  | $ 36,682 |  | $ 73,160
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 564 |  | $ 564 |  | $ 3,459
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 | 10 |  | 10 |  | 7
Fair value available-for-sale securities | $ 47,282 |  | $ 47,282 |  | $ 30,901
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 340 |  | $ 340 |  | $ 821
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 |  | 0
Fair value available-for-sale securities | $ 0 |  | $ 0 |  | $ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 0 |  | $ 0 |  | $ 0
Continuous Loss Position, Total |  |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 10 |  | 10 |  | 7
Fair value available-for-sale securities | $ 47,282 |  | $ 47,282 |  | $ 30,901
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 340 |  | $ 340 |  | $ 821
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 | 132 |  | 132 |  | 185
Fair value available-for-sale securities | $ 530,077 |  | $ 530,077 |  | $ 788,876
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 7,718 |  | $ 7,718 |  | $ 22,135
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 | 1 |  | 1 |  | 2
Fair value available-for-sale securities | $ 3,736 |  | $ 3,736 |  | $ 4,582
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 102 |  | $ 102 |  | $ 277
Continuous Loss Position, Total |  |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 133 |  | 133 |  | 187
Fair value available-for-sale securities | $ 533,813 |  | $ 533,813 |  | $ 793,458
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 7,820 |  | $ 7,820 |  | $ 22,412
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 | 32 |  | 32 |  | 56
Fair value available-for-sale securities | $ 128,589 |  | $ 128,589 |  | $ 311,031
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 2,733 |  | $ 2,733 |  | $ 7,822
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 |  | 1
Fair value available-for-sale securities | $ 6,529 |  | $ 6,529 |  | $ 1,398
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 75 |  | $ 75 |  | $ 9
Continuous Loss Position, Total |  |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 35 |  | 35 |  | 57
Fair value available-for-sale securities | $ 135,118 |  | $ 135,118 |  | $ 312,429
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 2,808 |  | $ 2,808 |  | $ 7,831
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 | 31 |  | 31 |  | 37
Fair value available-for-sale securities | $ 113,103 |  | $ 113,103 |  | $ 218,170
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 1,095 |  | $ 1,095 |  | $ 2,909
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 | 1 |  | 1 |  | 2
Fair value available-for-sale securities | $ 1,038 |  | $ 1,038 |  | $ 6,585
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 3 |  | $ 3 |  | $ 114
Continuous Loss Position, Total |  |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 32 |  | 32 |  | 39
Fair value available-for-sale securities | $ 114,141 |  | $ 114,141 |  | $ 224,755
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 1,098 |  | $ 1,098 |  | $ 3,023
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 | 83 |  | 83 |  | 58
Fair value available-for-sale securities | $ 205,378 |  | $ 205,378 |  | $ 131,268
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 575 |  | $ 575 |  | $ 470
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 |  | 16
Fair value available-for-sale securities | $ 0 |  | $ 0 |  | $ 45,886
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 0 |  | $ 0 |  | $ 442
Continuous Loss Position, Total |  |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 83 |  | 83 |  | 74
Fair value available-for-sale securities | $ 205,378 |  | $ 205,378 |  | $ 177,154
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 575 |  | $ 575 |  | $ 912
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 | 5 |  | 5 |  | 12
Fair value available-for-sale securities | $ 5,419 |  | $ 5,419 |  | $ 13,034
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 27 |  | $ 27 |  | $ 325
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 |  | 0
Fair value available-for-sale securities | $ 0 |  | $ 0 |  | $ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 0 |  | $ 0 |  | $ 0
Continuous Loss Position, Total |  |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 5 |  | 5 |  | 12
Fair value available-for-sale securities | $ 5,419 |  | $ 5,419 |  | $ 13,034
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 27 |  | $ 27 |  | $ 325
Debt Securities |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Other than Temporary Impairment Losses, Investments | 500 |  |  |  |
Equity securities |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Other than Temporary Impairment Losses, Investments | $ 500 |  |  |  |
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 | 11 |  | 11 |  |
Fair value available-for-sale securities | $ 73,441 |  | $ 73,441 |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 438 |  | $ 438 |  |
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 | 11 |  | 11 |  |
Fair value available-for-sale securities | $ 73,441 |  | $ 73,441 |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 438 |  | $ 438 |  |

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