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Note 4 - Investments - Net Investment Income (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Interest on cash and cash equivalents | $ 442 | $ 531 | $ 1,287 | $ 1,568
Net investment income | $ 442 | $ 531 | $ 1,287 | $ 1,568

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