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Note 4 - Investments - Net Investment Income (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Interest on cash and cash equivalents | $ 428 | $ 538 | $ 845 | $ 1,037
Net investment income | $ 428 | $ 538 | $ 845 | $ 1,037

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