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Note 5 - Investments Schedule of Unrealized Losses (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 USD ($) security | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) security | Sep. 30, 2016 USD ($) | Dec. 31, 2016 USD ($) security
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Other than Temporary Impairment Losses, Investments | $ 0 | $ 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 | 269 |  | 269 |  | 362
Fair value available-for-sale securities | $ 1,029,555 |  | $ 1,029,555 |  | $ 1,566,440
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 10,002 |  | $ 10,002 |  | $ 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 | 16 |  | 16 |  | 21
Fair value available-for-sale securities | $ 30,150 |  | $ 30,150 |  | $ 58,451
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 814 |  | $ 814 |  | $ 842
Continuous Loss Position, Total |  |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 285 |  | 285 |  | 383
Fair value available-for-sale securities | $ 1,059,705 |  | $ 1,059,705 |  | $ 1,624,891
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 10,816 |  | $ 10,816 |  | $ 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 | 8 |  | 8 |  | 7
Fair value available-for-sale securities | $ 37,926 |  | $ 37,926 |  | $ 73,160
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 604 |  | $ 604 |  | $ 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 | 2 |  | 2 |  | 0
Fair value available-for-sale securities | $ 1,580 |  | $ 1,580 |  | $ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 10 |  | $ 10 |  | $ 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 | $ 39,506 |  | $ 39,506 |  | $ 73,160
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 614 |  | $ 614 |  | $ 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 | 17 |  | 17 |  | 7
Fair value available-for-sale securities | $ 60,210 |  | $ 60,210 |  | $ 30,901
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 439 |  | $ 439 |  | $ 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 | 17 |  | 17 |  | 7
Fair value available-for-sale securities | $ 60,210 |  | $ 60,210 |  | $ 30,901
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 439 |  | $ 439 |  | $ 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 | 108 |  | 108 |  | 185
Fair value available-for-sale securities | $ 439,016 |  | $ 439,016 |  | $ 788,876
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 5,104 |  | $ 5,104 |  | $ 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 | 5 |  | 5 |  | 2
Fair value available-for-sale securities | $ 11,013 |  | $ 11,013 |  | $ 4,582
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 303 |  | $ 303 |  | $ 277
Continuous Loss Position, Total |  |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 113 |  | 113 |  | 187
Fair value available-for-sale securities | $ 450,029 |  | $ 450,029 |  | $ 793,458
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 5,407 |  | $ 5,407 |  | $ 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 | 29 |  | 29 |  | 56
Fair value available-for-sale securities | $ 114,243 |  | $ 114,243 |  | $ 311,031
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 1,862 |  | $ 1,862 |  | $ 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 | 5 |  | 5 |  | 1
Fair value available-for-sale securities | $ 14,262 |  | $ 14,262 |  | $ 1,398
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 315 |  | $ 315 |  | $ 9
Continuous Loss Position, Total |  |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 34 |  | 34 |  | 57
Fair value available-for-sale securities | $ 128,505 |  | $ 128,505 |  | $ 312,429
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 2,177 |  | $ 2,177 |  | $ 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 | 30 |  | 30 |  | 37
Fair value available-for-sale securities | $ 122,980 |  | $ 122,980 |  | $ 218,170
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 1,009 |  | $ 1,009 |  | $ 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 | 3 |  | 3 |  | 2
Fair value available-for-sale securities | $ 1,811 |  | $ 1,811 |  | $ 6,585
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 182 |  | $ 182 |  | $ 114
Continuous Loss Position, Total |  |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 33 |  | 33 |  | 39
Fair value available-for-sale securities | $ 124,791 |  | $ 124,791 |  | $ 224,755
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 1,191 |  | $ 1,191 |  | $ 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 | 64 |  | 64 |  | 58
Fair value available-for-sale securities | $ 174,128 |  | $ 174,128 |  | $ 131,268
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 478 |  | $ 478 |  | $ 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 | 1 |  | 1 |  | 16
Fair value available-for-sale securities | $ 1,484 |  | $ 1,484 |  | $ 45,886
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 4 |  | $ 4 |  | $ 442
Continuous Loss Position, Total |  |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 65 |  | 65 |  | 74
Fair value available-for-sale securities | $ 175,612 |  | $ 175,612 |  | $ 177,154
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 482 |  | $ 482 |  | $ 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 | 2 |  | 2 |  | 12
Fair value available-for-sale securities | $ 1,196 |  | $ 1,196 |  | $ 13,034
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 6 |  | $ 6 |  | $ 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 | 2 |  | 2 |  | 12
Fair value available-for-sale securities | $ 1,196 |  | $ 1,196 |  | $ 13,034
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 6 |  | 6 |  | $ 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 | $ 79,856 |  | $ 79,856 |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 500 |  | $ 500 |  |
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 | $ 79,856 |  | $ 79,856 |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 500 |  | $ 500 |  |

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