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Note 2 - Investments - Summary of Net Investment Income (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Interest income | $ 7,326 | $ 5,060
Dividend income | 197 | 181
Investment expense | (384) | (121)
Net investment income | $ 7,139 | $ 5,120

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