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Note 6 - Investments - Gross Unrealized Losses and Related Fair Values of Available for Sale Securities (Details) $ in Thousands | Dec. 31, 2020 USD ($) security | Dec. 31, 2019 USD ($) security
--- | --- | ---
Continuous Loss Position Less Than Twelve Months |  |
Number of Securities | security | 194 | 154
Fair value available-for-sale securities | $ 679,631 | $ 660,883
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | $ (12,101) | $ (4,183)
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |
Number of securities | security | 36 | 70
Fair value available-for-sale securities | $ 158,852 | $ 254,728
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | $ (2,056) | $ (4,145)
Continuous Loss Position, Total |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 230 | 224
Fair value available-for-sale securities | $ 838,483 | $ 915,611
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss | $ (14,157) | $ (8,328)
US government and agency securities |  |
Continuous Loss Position Less Than Twelve Months |  |
Number of Securities | security | 4 | 2
Fair value available-for-sale securities | $ 90,591 | $ 26,142
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | $ (3,611) | $ (731)
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |
Number of securities | security | 0 | 2
Fair value available-for-sale securities | $ 0 | $ 2,529
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | $ 0 | $ (2)
Continuous Loss Position, Total |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 4 | 4
Fair value available-for-sale securities | $ 90,591 | $ 28,671
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss | $ (3,611) | $ (733)
State and municipal obligations |  |
Continuous Loss Position Less Than Twelve Months |  |
Number of Securities | security | 4 | 1
Fair value available-for-sale securities | $ 9,626 | $ 3,959
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | $ (100) | $ (41)
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |
Number of securities | security | 0 | 0
Fair value available-for-sale securities | $ 0 | $ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | $ 0 | $ 0
Continuous Loss Position, Total |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 4 | 1
Fair value available-for-sale securities | $ 9,626 | $ 3,959
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss | $ (100) | $ (41)
Corporate bonds and notes |  |
Continuous Loss Position Less Than Twelve Months |  |
Number of Securities | security | 60 | 25
Fair value available-for-sale securities | $ 174,848 | $ 110,871
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | $ (3,758) | $ (1,728)
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |
Number of securities | security | 0 | 0
Fair value available-for-sale securities | $ 0 | $ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | $ 0 | $ 0
Continuous Loss Position, Total |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 60 | 25
Fair value available-for-sale securities | $ 174,848 | $ 110,871
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss | $ (3,758) | $ (1,728)
RMBS |  |
Continuous Loss Position Less Than Twelve Months |  |
Number of Securities | security | 5 | 27
Fair value available-for-sale securities | $ 42,003 | $ 184,378
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | $ (305) | $ (535)
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |
Number of securities | security | 2 | 16
Fair value available-for-sale securities | $ 915 | $ 36,192
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | $ (9) | $ (992)
Continuous Loss Position, Total |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 7 | 43
Fair value available-for-sale securities | $ 42,918 | $ 220,570
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss | $ (314) | $ (1,527)
CMBS |  |
Continuous Loss Position Less Than Twelve Months |  |
Number of Securities | security | 43 | 33
Fair value available-for-sale securities | $ 118,345 | $ 89,994
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | $ (3,035) | $ (463)
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |
Number of securities | security | 6 | 8
Fair value available-for-sale securities | $ 8,312 | $ 6,346
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | $ (266) | $ (147)
Continuous Loss Position, Total |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 49 | 41
Fair value available-for-sale securities | $ 126,657 | $ 96,340
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss | $ (3,301) | $ (610)
Other ABS |  |
Continuous Loss Position Less Than Twelve Months |  |
Number of Securities | security | 26 | 32
Fair value available-for-sale securities | $ 70,759 | $ 74,733
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | $ (322) | $ (358)
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |
Number of securities | security | 3 | 8
Fair value available-for-sale securities | $ 12,119 | $ 25,178
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | $ (110) | $ (214)
Continuous Loss Position, Total |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 29 | 40
Fair value available-for-sale securities | $ 82,878 | $ 99,911
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss | $ (432) | $ (572)
CLO |  |
Continuous Loss Position Less Than Twelve Months |  |
Number of Securities | security | 52 | 34
Fair value available-for-sale securities | $ 173,459 | $ 170,806
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | $ (970) | $ (327)
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |
Number of securities | security | 25 | 36
Fair value available-for-sale securities | $ 137,506 | $ 184,483
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | $ (1,671) | $ (2,790)
Continuous Loss Position, Total |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 77 | 70
Fair value available-for-sale securities | $ 310,965 | $ 355,289
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss | $ (2,641) | $ (3,117)

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