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Note 2 - Investments - Summary of Net Investment Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Interest income | $ 5,952 | $ 3,688 | $ 16,468 | $ 9,328
Dividend income | 211 | 178 | 602 | 518
Investment expense | (134) | (122) | (380) | (384)
Net investment income | $ 6,029 | $ 3,744 | $ 16,690 | $ 9,462

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