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Note 2 - Investments - Security Holdings in an Unrealized Loss Position (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
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Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Less than 12 Months, fair value | $ 230,995 | $ 354,769
Less than 12 Months, Accumulated Loss | (5,798) | (8,726)
12 Months or Longer, fair value | 264,175 | 309,203
12 Months or Longer, Accumulated Loss | (20,897) | (28,531)
Fair value | 495,170 | 663,972
Accumulated Loss | (26,695) | (37,257)
US Government Agencies Debt Securities [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Less than 12 Months, fair value | 7,152 | 16,507
Less than 12 Months, Accumulated Loss | (3) | (65)
12 Months or Longer, fair value | 10,029 | 14,291
12 Months or Longer, Accumulated Loss | (345) | (584)
Fair value | 17,181 | 30,798
Accumulated Loss | (348) | (649)
US States and Political Subdivisions Debt Securities [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Less than 12 Months, fair value | 7,358 | 2,614
Less than 12 Months, Accumulated Loss | (1,099) | (419)
12 Months or Longer, fair value | 8,069 | 5,076
12 Months or Longer, Accumulated Loss | (419) | (438)
Fair value | 15,427 | 7,690
Accumulated Loss | (1,518) | (857)
Special Revenue Excluding Asset Backed Securities [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Less than 12 Months, fair value | 1,618 | 2,182
Less than 12 Months, Accumulated Loss | (99) | (426)
12 Months or Longer, fair value | 14,481 | 21,733
12 Months or Longer, Accumulated Loss | (2,347) | (3,308)
Fair value | 16,099 | 23,915
Accumulated Loss | (2,446) | (3,734)
Corporate Debt Securities and Other Debt Obligations [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Less than 12 Months, fair value | 111,899 | 181,179
Less than 12 Months, Accumulated Loss | (3,475) | (4,996)
12 Months or Longer, fair value | 143,214 | 176,531
12 Months or Longer, Accumulated Loss | (8,388) | (13,353)
Fair value | 255,113 | 357,710
Accumulated Loss | (11,863) | (18,349)
Asset-Backed Securities [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Less than 12 Months, fair value | 102,968 | 152,287
Less than 12 Months, Accumulated Loss | (1,122) | (2,820)
12 Months or Longer, fair value | 88,382 | 91,572
12 Months or Longer, Accumulated Loss | (9,398) | (10,848)
Fair value | 191,350 | 243,859
Accumulated Loss | $ (10,520) | $ (13,668)

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