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Note 6 - Investments - Gross Unrealized Losses and Fair Value of Available for Sale Securities (Details) $ in Thousands | Mar. 31, 2021 USD ($) security | Dec. 31, 2020 USD ($) security
--- | --- | ---
Continuous Loss Position Less Than Twelve Months [Abstract] |  |
Number of Securities, Less than 12 Months | security | 411 | 194
Fair Value, Less Than 12 Months | $ 1,498,256 | $ 679,631
Unrealized Losses, Less Than 12 Months | $ (65,865) | $ (12,101)
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |
Number of Securities, 12 Months or Greater | security | 47 | 36
Fair Value, 12 Months or Greater | $ 146,430 | $ 158,852
Unrealized Losses, 12 Months or Greater | $ (1,991) | $ (2,056)
Continuous Loss Position, Total |  |
Number of Securities, Total | security | 458 | 230
Fair Value, Total | $ 1,644,686 | $ 838,483
Unrealized Losses, Total | $ (67,856) | $ (14,157)
U.S. government and agencies securities |  |
Continuous Loss Position Less Than Twelve Months [Abstract] |  |
Number of Securities, Less than 12 Months | security | 7 | 4
Fair Value, Less Than 12 Months | $ 87,663 | $ 90,591
Unrealized Losses, Less Than 12 Months | $ (8,681) | $ (3,611)
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |
Number of Securities, 12 Months or Greater | security | 0 | 0
Fair Value, 12 Months or Greater | $ 0 | $ 0
Unrealized Losses, 12 Months or Greater | $ 0 | $ 0
Continuous Loss Position, Total |  |
Number of Securities, Total | security | 7 | 4
Fair Value, Total | $ 87,663 | $ 90,591
Unrealized Losses, Total | $ (8,681) | $ (3,611)
State and municipal obligations |  |
Continuous Loss Position Less Than Twelve Months [Abstract] |  |
Number of Securities, Less than 12 Months | security | 29 | 4
Fair Value, Less Than 12 Months | $ 37,553 | $ 9,626
Unrealized Losses, Less Than 12 Months | $ (1,510) | $ (100)
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |
Number of Securities, 12 Months or Greater | security | 0 | 0
Fair Value, 12 Months or Greater | $ 0 | $ 0
Unrealized Losses, 12 Months or Greater | $ 0 | $ 0
Continuous Loss Position, Total |  |
Number of Securities, Total | security | 29 | 4
Fair Value, Total | $ 37,553 | $ 9,626
Unrealized Losses, Total | $ (1,510) | $ (100)
Corporate bonds and notes |  |
Continuous Loss Position Less Than Twelve Months [Abstract] |  |
Number of Securities, Less than 12 Months | security | 225 | 60
Fair Value, Less Than 12 Months | $ 819,835 | $ 174,848
Unrealized Losses, Less Than 12 Months | $ (47,419) | $ (3,758)
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |
Number of Securities, 12 Months or Greater | security | 1 | 0
Fair Value, 12 Months or Greater | $ 2,725 | $ 0
Unrealized Losses, 12 Months or Greater | $ (181) | $ 0
Continuous Loss Position, Total |  |
Number of Securities, Total | security | 226 | 60
Fair Value, Total | $ 822,560 | $ 174,848
Unrealized Losses, Total | $ (47,600) | $ (3,758)
RMBS |  |
Continuous Loss Position Less Than Twelve Months [Abstract] |  |
Number of Securities, Less than 12 Months | security | 32 | 5
Fair Value, Less Than 12 Months | $ 239,012 | $ 42,003
Unrealized Losses, Less Than 12 Months | $ (3,654) | $ (305)
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |
Number of Securities, 12 Months or Greater | security | 2 | 2
Fair Value, 12 Months or Greater | $ 869 | $ 915
Unrealized Losses, 12 Months or Greater | $ (12) | $ (9)
Continuous Loss Position, Total |  |
Number of Securities, Total | security | 34 | 7
Fair Value, Total | $ 239,881 | $ 42,918
Unrealized Losses, Total | $ (3,666) | $ (314)
CMBS |  |
Continuous Loss Position Less Than Twelve Months [Abstract] |  |
Number of Securities, Less than 12 Months | security | 51 | 43
Fair Value, Less Than 12 Months | $ 111,105 | $ 118,345
Unrealized Losses, Less Than 12 Months | $ (4,146) | $ (3,035)
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |
Number of Securities, 12 Months or Greater | security | 17 | 6
Fair Value, 12 Months or Greater | $ 42,527 | $ 8,312
Unrealized Losses, 12 Months or Greater | $ (1,184) | $ (266)
Continuous Loss Position, Total |  |
Number of Securities, Total | security | 68 | 49
Fair Value, Total | $ 153,632 | $ 126,657
Unrealized Losses, Total | $ (5,330) | $ (3,301)
CLO |  |
Continuous Loss Position Less Than Twelve Months [Abstract] |  |
Number of Securities, Less than 12 Months | security | 33 | 52
Fair Value, Less Than 12 Months | $ 101,725 | $ 173,459
Unrealized Losses, Less Than 12 Months | $ (172) | $ (970)
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |
Number of Securities, 12 Months or Greater | security | 24 | 25
Fair Value, 12 Months or Greater | $ 92,497 | $ 137,506
Unrealized Losses, 12 Months or Greater | $ (436) | $ (1,671)
Continuous Loss Position, Total |  |
Number of Securities, Total | security | 57 | 77
Fair Value, Total | $ 194,222 | $ 310,965
Unrealized Losses, Total | $ (608) | $ (2,641)
Other ABS |  |
Continuous Loss Position Less Than Twelve Months [Abstract] |  |
Number of Securities, Less than 12 Months | security | 34 | 26
Fair Value, Less Than 12 Months | $ 101,363 | $ 70,759
Unrealized Losses, Less Than 12 Months | $ (283) | $ (322)
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |
Number of Securities, 12 Months or Greater | security | 3 | 3
Fair Value, 12 Months or Greater | $ 7,812 | $ 12,119
Unrealized Losses, 12 Months or Greater | $ (178) | $ (110)
Continuous Loss Position, Total |  |
Number of Securities, Total | security | 37 | 29
Fair Value, Total | $ 109,175 | $ 82,878
Unrealized Losses, Total | $ (461) | $ (432)

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