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Note 6 - Investments - Gross Unrealized Losses and Fair Value of Available for Sale Securities (Details) $ in Thousands | Sep. 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 | 309 | 154
Fair Value, Less Than 12 Months | $ 930,550 | $ 660,883
Unrealized Losses, Less Than 12 Months | $ (16,906) | $ (4,183)
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |
Number of Securities, 12 Months or Greater | security | 37 | 70
Fair Value, 12 Months or Greater | $ 160,200 | $ 254,728
Unrealized Losses, 12 Months or Greater | $ (3,590) | $ (4,145)
Continuous Loss Position, Total |  |
Number of Securities, Total | security | 346 | 224
Fair Value, Total | $ 1,090,750 | $ 915,611
Unrealized Losses, Total | $ (20,496) | $ (8,328)
U.S. government and agencies securities |  |
Continuous Loss Position Less Than Twelve Months [Abstract] |  |
Number of Securities, Less than 12 Months | security | 4 | 2
Fair Value, Less Than 12 Months | $ 99,250 | $ 26,142
Unrealized Losses, Less Than 12 Months | $ (1,661) | $ (731)
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |
Number of Securities, 12 Months or Greater | security | 0 | 2
Fair Value, 12 Months or Greater | $ 0 | $ 2,529
Unrealized Losses, 12 Months or Greater | $ 0 | $ (2)
Continuous Loss Position, Total |  |
Number of Securities, Total | security | 4 | 4
Fair Value, Total | $ 99,250 | $ 28,671
Unrealized Losses, Total | $ (1,661) | $ (733)
State and municipal obligations |  |
Continuous Loss Position Less Than Twelve Months [Abstract] |  |
Number of Securities, Less than 12 Months | security | 10 | 1
Fair Value, Less Than 12 Months | $ 27,543 | $ 3,959
Unrealized Losses, Less Than 12 Months | $ (193) | $ (41)
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 | 10 | 1
Fair Value, Total | $ 27,543 | $ 3,959
Unrealized Losses, Total | $ (193) | $ (41)
Corporate bonds and notes |  |
Continuous Loss Position Less Than Twelve Months [Abstract] |  |
Number of Securities, Less than 12 Months | security | 130 | 25
Fair Value, Less Than 12 Months | $ 306,915 | $ 110,871
Unrealized Losses, Less Than 12 Months | $ (7,471) | $ (1,728)
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 | 130 | 25
Fair Value, Total | $ 306,915 | $ 110,871
Unrealized Losses, Total | $ (7,471) | $ (1,728)
RMBS |  |
Continuous Loss Position Less Than Twelve Months [Abstract] |  |
Number of Securities, Less than 12 Months | security | 4 | 27
Fair Value, Less Than 12 Months | $ 11,723 | $ 184,378
Unrealized Losses, Less Than 12 Months | $ (19) | $ (535)
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |
Number of Securities, 12 Months or Greater | security | 2 | 16
Fair Value, 12 Months or Greater | $ 956 | $ 36,192
Unrealized Losses, 12 Months or Greater | $ (11) | $ (992)
Continuous Loss Position, Total |  |
Number of Securities, Total | security | 6 | 43
Fair Value, Total | $ 12,679 | $ 220,570
Unrealized Losses, Total | $ (30) | $ (1,527)
CMBS |  |
Continuous Loss Position Less Than Twelve Months [Abstract] |  |
Number of Securities, Less than 12 Months | security | 60 | 36
Fair Value, Less Than 12 Months | $ 176,482 | $ 109,589
Unrealized Losses, Less Than 12 Months | $ (4,537) | $ (478)
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |
Number of Securities, 12 Months or Greater | security | 6 | 8
Fair Value, 12 Months or Greater | $ 7,146 | $ 6,346
Unrealized Losses, 12 Months or Greater | $ (254) | $ (147)
Continuous Loss Position, Total |  |
Number of Securities, Total | security | 66 | 44
Fair Value, Total | $ 183,628 | $ 115,935
Unrealized Losses, Total | $ (4,791) | $ (625)
Other ABS |  |
Continuous Loss Position Less Than Twelve Months [Abstract] |  |
Number of Securities, Less than 12 Months | security | 101 | 63
Fair Value, Less Than 12 Months | $ 308,637 | $ 225,944
Unrealized Losses, Less Than 12 Months | $ (3,025) | $ (670)
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |
Number of Securities, 12 Months or Greater | security | 29 | 44
Fair Value, 12 Months or Greater | $ 152,098 | $ 209,661
Unrealized Losses, 12 Months or Greater | $ (3,325) | $ (3,004)
Continuous Loss Position, Total |  |
Number of Securities, Total | security | 130 | 107
Fair Value, Total | $ 460,735 | $ 435,605
Unrealized Losses, Total | $ (6,350) | $ (3,674)

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