Note 2 - Investments - Summary of Net Investment Income (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Investments, Debt and Equity Securities [Abstract] | ||||
| Interest income | $ 19,090 | $ 13,344 | $ 36,398 | $ 25,308 |
| Dividend income | 1,370 | 242 | 2,340 | 559 |
| Investment expense | (510) | (216) | (804) | (426) |
| Net investment income | $ 19,950 | $ 13,370 | $ 37,934 | $ 25,441 |
| X | ||||||||||
- Definition Amount of income (expenses) related to the generation of investment income. No definition available.
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| X | ||||||||||
- Definition Amount of dividend income on nonoperating securities. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount after accretion (amortization) of discount (premium), and investment expense, of interest income and dividend income on nonoperating securities. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- References No definition available.
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