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Note 6 - Investments Gross Unrealized Losses and Related Fair Values of Available for Sale Securities (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($) security | Dec. 31, 2018 USD ($) security | Dec. 31, 2017 USD ($)
Continuous Loss Position Less Than Twelve Months |  |  |
Number of Securities | security | 154 | 550 |
Fair value available-for-sale securities | $ 660,883 | $ 2,201,228 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | $ 4,183 | $ 50,707 |
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |  |
Number of securities | security | 70 | 237 |
Fair value available-for-sale securities | $ 254,728 | $ 957,742 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | $ 4,145 | $ 37,333 |
Continuous Loss Position, Total |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 224 | 787 |
Fair value available-for-sale securities | $ 915,611 | $ 3,158,970 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss | 8,328 | 88,040 |
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net | 0 | 1,700 | $ 1,400
Other Than Temporary Impairment Losses, Investments, Credit Losses, Portion Recognized in AOCI | $ 0 | $ 0 | $ 0
US government and agency securities |  |  |
Continuous Loss Position Less Than Twelve Months |  |  |
Number of Securities | security | 2 | 2 |
Fair value available-for-sale securities | $ 26,142 | $ 27,415 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | $ 731 | $ 796 |
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |  |
Number of securities | security | 2 | 8 |
Fair value available-for-sale securities | $ 2,529 | $ 23,476 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | $ 2 | $ 712 |
Continuous Loss Position, Total |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 4 | 10 |
Fair value available-for-sale securities | $ 28,671 | $ 50,891 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss | $ 733 | $ 1,508 |
State and municipal obligations |  |  |
Continuous Loss Position Less Than Twelve Months |  |  |
Number of Securities | security | 1 | 12 |
Fair value available-for-sale securities | $ 3,959 | $ 41,263 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | $ 41 | $ 955 |
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |  |
Number of securities | security | 0 | 16 |
Fair value available-for-sale securities | $ 0 | $ 39,982 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | $ 0 | $ 945 |
Continuous Loss Position, Total |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 1 | 28 |
Fair value available-for-sale securities | $ 3,959 | $ 81,245 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss | $ 41 | $ 1,900 |
Corporate bonds and notes |  |  |
Continuous Loss Position Less Than Twelve Months |  |  |
Number of Securities | security | 25 | 330 |
Fair value available-for-sale securities | $ 110,871 | $ 1,208,430 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | $ 1,728 | $ 36,284 |
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |  |
Number of securities | security | 0 | 126 |
Fair value available-for-sale securities | $ 0 | $ 601,533 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | $ 0 | $ 27,604 |
Continuous Loss Position, Total |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 25 | 456 |
Fair value available-for-sale securities | $ 110,871 | $ 1,809,963 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss | $ 1,728 | $ 63,888 |
RMBS |  |  |
Continuous Loss Position Less Than Twelve Months |  |  |
Number of Securities | security | 27 | 15 |
Fair value available-for-sale securities | $ 184,378 | $ 92,315 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | $ 535 | $ 782 |
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |  |
Number of securities | security | 16 | 28 |
Fair value available-for-sale securities | $ 36,192 | $ 77,395 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | $ 992 | $ 3,704 |
Continuous Loss Position, Total |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 43 | 43 |
Fair value available-for-sale securities | $ 220,570 | $ 169,710 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss | $ 1,527 | $ 4,486 |
CMBS |  |  |
Continuous Loss Position Less Than Twelve Months |  |  |
Number of Securities | security | 36 | 62 |
Fair value available-for-sale securities | $ 109,589 | $ 328,696 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | $ 478 | $ 3,973 |
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |  |
Number of securities | security | 8 | 33 |
Fair value available-for-sale securities | $ 6,346 | $ 125,728 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | $ 147 | $ 3,385 |
Continuous Loss Position, Total |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 44 | 95 |
Fair value available-for-sale securities | $ 115,935 | $ 454,424 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss | $ 625 | $ 7,358 |
Other ABS |  |  |
Continuous Loss Position Less Than Twelve Months |  |  |
Number of Securities | security | 63 | 129 |
Fair value available-for-sale securities | $ 225,944 | $ 503,109 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | $ 670 | $ 7,917 |
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |  |
Number of securities | security | 44 | 26 |
Fair value available-for-sale securities | $ 209,661 | $ 89,628 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | $ 3,004 | $ 983 |
Continuous Loss Position, Total |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 107 | 155 |
Fair value available-for-sale securities | $ 435,605 | $ 592,737 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss | $ 3,674 | $ 8,900 |

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