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Note 2 - Investments in Bond Securities - Maturities of Debt Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
One year or less, amortized cost | $ 2,687 | $ 2,671
One year or less, fair value | 2,692 | 2,671
Greater than one year through five years, amortized cost | 0 | 464
Greater than one year through five years, fair value | 0 | 468
Amortized cost | 2,687 | 3,135
Fair value | $ 2,692 | $ 3,139

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