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Note 2 - Investments - Security Holdings in an Unrealized Loss Position (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Less than 12 Months, fair value | $ 162,375 | $ 384,693
Less than 12 Months, Accumulated Loss | (5,900) | (31,558)
12 Months or Longer, fair value | 387,038 | 99,986
12 Months or Longer, Accumulated Loss | (49,359) | (15,365)
Fair value | 549,413 | 484,679
Accumulated Loss | (55,259) | (46,923)
US Government Agencies Debt Securities [Member] |  |
Less than 12 Months, fair value | 2,338 | 41,077
Less than 12 Months, Accumulated Loss | (12) | (1,523)
12 Months or Longer, fair value | 40,352 | 6,853
12 Months or Longer, Accumulated Loss | (2,081) | (730)
Fair value | 42,690 | 47,930
Accumulated Loss | (2,093) | (2,253)
States Territories Possessions Debt Securities [Member] |  |
Less than 12 Months, fair value | 2,041 | 3,227
Less than 12 Months, Accumulated Loss | (30) | (552)
12 Months or Longer, fair value | 3,172 | 0
12 Months or Longer, Accumulated Loss | (599) | 0
Fair value | 5,213 | 3,227
Accumulated Loss | (629) | (552)
Political Subdivisions Debt Securities [Member] |  |
Less than 12 Months, fair value | 0 | 4,298
Less than 12 Months, Accumulated Loss | 0 | (621)
12 Months or Longer, fair value | 3,848 | 0
12 Months or Longer, Accumulated Loss | (585) | 0
Fair value | 3,848 | 4,298
Accumulated Loss | (585) | (621)
Special Revenue Excluding Asset Backed Securities [Member] |  |
Less than 12 Months, fair value | 2,617 | 25,091
Less than 12 Months, Accumulated Loss | (148) | (3,287)
12 Months or Longer, fair value | 25,251 | 5,080
12 Months or Longer, Accumulated Loss | (5,220) | (1,200)
Fair value | 27,868 | 30,171
Accumulated Loss | (5,368) | (4,487)
Corporate Debt Securities and Other Debt Obligations [Member] |  |
Less than 12 Months, fair value | 66,836 | 192,185
Less than 12 Months, Accumulated Loss | (3,296) | (15,667)
12 Months or Longer, fair value | 197,097 | 55,605
12 Months or Longer, Accumulated Loss | (25,040) | (8,481)
Fair value | 263,933 | 247,790
Accumulated Loss | (28,336) | (24,148)
Asset-Backed Securities [Member] |  |
Less than 12 Months, fair value | 88,543 | 118,815
Less than 12 Months, Accumulated Loss | (2,414) | (9,908)
12 Months or Longer, fair value | 117,318 | 32,448
12 Months or Longer, Accumulated Loss | (15,834) | (4,954)
Fair value | 205,861 | 151,263
Accumulated Loss | $ (18,248) | $ (14,862)

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