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Note 5 - Investments Gross Unrealized Losses and Fair Value of Available for Sale Securities (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 USD ($) security | Jun. 30, 2020 USD ($) security | Dec. 31, 2019 USD ($) security
Continuous Loss Position Less Than Twelve Months [Abstract] |  |  |
Number of Securities, Less than 12 Months | security | 232 | 232 | 154
Fair Value, Less Than 12 Months | $ 729,300 | $ 729,300 | $ 660,883
Unrealized Losses, Less Than 12 Months | $ (22,118) | $ (22,118) | $ (4,183)
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |  |
Number of Securities, 12 Months or Greater | security | 34 | 34 | 70
Fair Value, 12 Months or Greater | $ 146,401 | $ 146,401 | $ 254,728
Unrealized Losses, 12 Months or Greater | $ (5,791) | $ (5,791) | $ (4,145)
Continuous Loss Position, Total |  |  |
Number of Securities, Total | security | 266 | 266 | 224
Fair Value, Total | $ 875,701 | $ 875,701 | $ 915,611
Unrealized Losses, Total | (27,909) | (27,909) | $ (8,328)
Other-than-temporary impairment losses | $ (3,600) | $ (4,200) |
US government and agency securities |  |  |
Continuous Loss Position Less Than Twelve Months [Abstract] |  |  |
Number of Securities, Less than 12 Months | security |  |  | 2
Fair Value, Less Than 12 Months |  |  | $ 26,142
Unrealized Losses, Less Than 12 Months |  |  | $ (731)
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |  |
Number of Securities, 12 Months or Greater | security |  |  | 2
Fair Value, 12 Months or Greater |  |  | $ 2,529
Unrealized Losses, 12 Months or Greater |  |  | $ (2)
Continuous Loss Position, Total |  |  |
Number of Securities, Total | security |  |  | 4
Fair Value, Total |  |  | $ 28,671
Unrealized Losses, Total |  |  | $ (733)
State and municipal obligations |  |  |
Continuous Loss Position Less Than Twelve Months [Abstract] |  |  |
Number of Securities, Less than 12 Months | security | 3 | 3 | 1
Fair Value, Less Than 12 Months | $ 8,540 | $ 8,540 | $ 3,959
Unrealized Losses, Less Than 12 Months | $ (91) | $ (91) | $ (41)
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |  |
Number of Securities, 12 Months or Greater | security | 0 | 0 | 0
Fair Value, 12 Months or Greater | $ 0 | $ 0 | $ 0
Unrealized Losses, 12 Months or Greater | $ 0 | $ 0 | $ 0
Continuous Loss Position, Total |  |  |
Number of Securities, Total | security | 3 | 3 | 1
Fair Value, Total | $ 8,540 | $ 8,540 | $ 3,959
Unrealized Losses, Total | $ (91) | $ (91) | $ (41)
Corporate bonds and notes |  |  |
Continuous Loss Position Less Than Twelve Months [Abstract] |  |  |
Number of Securities, Less than 12 Months | security | 56 | 56 | 25
Fair Value, Less Than 12 Months | $ 181,498 | $ 181,498 | $ 110,871
Unrealized Losses, Less Than 12 Months | $ (3,572) | $ (3,572) | $ (1,728)
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |  |
Number of Securities, 12 Months or Greater | security | 0 | 0 | 0
Fair Value, 12 Months or Greater | $ 0 | $ 0 | $ 0
Unrealized Losses, 12 Months or Greater | $ 0 | $ 0 | $ 0
Continuous Loss Position, Total |  |  |
Number of Securities, Total | security | 56 | 56 | 25
Fair Value, Total | $ 181,498 | $ 181,498 | $ 110,871
Unrealized Losses, Total | $ (3,572) | $ (3,572) | $ (1,728)
RMBS |  |  |
Continuous Loss Position Less Than Twelve Months [Abstract] |  |  |
Number of Securities, Less than 12 Months | security | 2 | 2 | 27
Fair Value, Less Than 12 Months | $ 3,776 | $ 3,776 | $ 184,378
Unrealized Losses, Less Than 12 Months | $ (2) | $ (2) | $ (535)
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |  |
Number of Securities, 12 Months or Greater | security | 3 | 3 | 16
Fair Value, 12 Months or Greater | $ 10,220 | $ 10,220 | $ 36,192
Unrealized Losses, 12 Months or Greater | $ (80) | $ (80) | $ (992)
Continuous Loss Position, Total |  |  |
Number of Securities, Total | security | 5 | 5 | 43
Fair Value, Total | $ 13,996 | $ 13,996 | $ 220,570
Unrealized Losses, Total | $ (82) | $ (82) | $ (1,527)
CMBS |  |  |
Continuous Loss Position Less Than Twelve Months [Abstract] |  |  |
Number of Securities, Less than 12 Months | security | 47 | 47 | 36
Fair Value, Less Than 12 Months | $ 130,339 | $ 130,339 | $ 109,589
Unrealized Losses, Less Than 12 Months | $ (8,353) | $ (8,353) | $ (478)
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |  |
Number of Securities, 12 Months or Greater | security | 5 | 5 | 8
Fair Value, 12 Months or Greater | $ 6,965 | $ 6,965 | $ 6,346
Unrealized Losses, 12 Months or Greater | $ (312) | $ (312) | $ (147)
Continuous Loss Position, Total |  |  |
Number of Securities, Total | security | 52 | 52 | 44
Fair Value, Total | $ 137,304 | $ 137,304 | $ 115,935
Unrealized Losses, Total | $ (8,665) | $ (8,665) | $ (625)
Other ABS |  |  |
Continuous Loss Position Less Than Twelve Months [Abstract] |  |  |
Number of Securities, Less than 12 Months | security | 124 | 124 | 63
Fair Value, Less Than 12 Months | $ 405,147 | $ 405,147 | $ 225,944
Unrealized Losses, Less Than 12 Months | $ (10,100) | $ (10,100) | $ (670)
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |  |
Number of Securities, 12 Months or Greater | security | 26 | 26 | 44
Fair Value, 12 Months or Greater | $ 129,216 | $ 129,216 | $ 209,661
Unrealized Losses, 12 Months or Greater | $ (5,399) | $ (5,399) | $ (3,004)
Continuous Loss Position, Total |  |  |
Number of Securities, Total | security | 150 | 150 | 107
Fair Value, Total | $ 534,363 | $ 534,363 | $ 435,605
Unrealized Losses, Total | $ (15,499) | $ (15,499) | $ (3,674)

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