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Note 3 - Investments - Security Holdings in an Unrealized Loss Position (Details) - USD ($) $ in Thousands | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Less than 12 Months, fair value | $ 104,439 | $ 354,769
Less than 12 Months, Accumulated Loss | (1,833) | (8,726)
12 Months or Longer, fair value | 270,911 | 309,203
12 Months or Longer, Accumulated Loss | (17,678) | (28,531)
Fair value | 375,350 | 663,972
Accumulated Loss | (19,511) | (37,257)
US Government Agencies Debt Securities [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Less than 12 Months, fair value | 2,006 | 16,507
Less than 12 Months, Accumulated Loss | (38) | (65)
12 Months or Longer, fair value | 5,704 | 14,291
12 Months or Longer, Accumulated Loss | (188) | (584)
Fair value | 7,710 | 30,798
Accumulated Loss | (226) | (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 | 5,157 | 2,614
Less than 12 Months, Accumulated Loss | (441) | (419)
12 Months or Longer, fair value | 9,509 | 5,076
12 Months or Longer, Accumulated Loss | (553) | (438)
Fair value | 14,666 | 7,690
Accumulated Loss | (994) | (857)
Special Revenue Excluding Asset Backed Securities [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Less than 12 Months, fair value | 0 | 2,182
Less than 12 Months, Accumulated Loss | 0 | (426)
12 Months or Longer, fair value | 15,185 | 21,733
12 Months or Longer, Accumulated Loss | (1,887) | (3,308)
Fair value | 15,185 | 23,915
Accumulated Loss | (1,887) | (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 | 49,963 | 181,179
Less than 12 Months, Accumulated Loss | (948) | (4,996)
12 Months or Longer, fair value | 160,780 | 176,531
12 Months or Longer, Accumulated Loss | (7,456) | (13,353)
Fair value | 210,743 | 357,710
Accumulated Loss | (8,404) | (18,349)
Asset-Backed Securities [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Less than 12 Months, fair value | 47,313 | 152,287
Less than 12 Months, Accumulated Loss | (406) | (2,820)
12 Months or Longer, fair value | 79,733 | 91,572
12 Months or Longer, Accumulated Loss | (7,594) | (10,848)
Fair value | 127,046 | 243,859
Accumulated Loss | $ (8,000) | $ (13,668)

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