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Note 2 - Investments - Maturities of Debt Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
One year or less, amortized cost | $ 2,671 | $ 2,432
One year or less, fair value | 2,671 | 2,440
Greater than one year through five years, amortized cost | 464 | 551
Greater than one year through five years, fair value | 468 | 552
Amortized cost | 3,135 | 2,983
Fair value | $ 3,139 | $ 2,992

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