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Note 3 - Investments - Summary of Net Investment Income (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract] |  |  |
Interest income | $ 55,164 | $ 35,433 | $ 23,349
Dividend income | 1,869 | 1,075 | 871
Investment expense | (1,028) | (684) | (515)
Net investment income | $ 56,005 | $ 35,824 | $ 23,705

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