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Note 2 - Investments - Security Holdings in an Unrealized Loss Position (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Less than 12 Months, fair value | $ 104,426 | $ 58,944
Less than 12 Months, Accumulated Loss | (1,651) | (726)
12 Months or Longer, fair value | 374,224 | 392,045
12 Months or Longer, Accumulated Loss | (34,955) | (33,577)
Fair value | 478,650 | 450,989
Accumulated Loss | (36,606) | (34,303)
US Government Agencies Debt Securities [Member] |  |
Less than 12 Months, fair value | 17,385 | 738
Less than 12 Months, Accumulated Loss | (385) | (1)
12 Months or Longer, fair value | 20,957 | 38,063
12 Months or Longer, Accumulated Loss | (1,002) | (1,415)
Fair value | 38,342 | 38,801
Accumulated Loss | (1,387) | (1,416)
US States and Political Subdivisions Debt Securities [Member] |  |
Less than 12 Months, fair value | 512 | 0
Less than 12 Months, Accumulated Loss | (5) | 0
12 Months or Longer, fair value | 6,217 | 6,196
12 Months or Longer, Accumulated Loss | (814) | (839)
Fair value | 6,729 | 6,196
Accumulated Loss | (819) | (839)
Special Revenue Excluding Asset Backed Securities [Member] |  |
Less than 12 Months, fair value | 0 | 0
Less than 12 Months, Accumulated Loss | 0 | 0
12 Months or Longer, fair value | 26,380 | 26,736
12 Months or Longer, Accumulated Loss | (3,415) | (3,149)
Fair value | 26,380 | 26,736
Accumulated Loss | (3,415) | (3,149)
Corporate Debt Securities and Other Debt Obligations [Member] |  |
Less than 12 Months, fair value | 41,802 | 28,872
Less than 12 Months, Accumulated Loss | (402) | (480)
12 Months or Longer, fair value | 212,756 | 204,034
12 Months or Longer, Accumulated Loss | (17,878) | (16,717)
Fair value | 254,558 | 232,906
Accumulated Loss | (18,280) | (17,197)
Asset-Backed Securities [Member] |  |
Less than 12 Months, fair value | 44,727 | 29,334
Less than 12 Months, Accumulated Loss | (859) | (245)
12 Months or Longer, fair value | 107,914 | 117,016
12 Months or Longer, Accumulated Loss | (11,846) | (11,457)
Fair value | 152,641 | 146,350
Accumulated Loss | $ (12,705) | $ (11,702)

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