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Note 7 - Marketable Securities - Summary of Gross Unrealized Losses and Fair Values on Investments (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Less than 12 months, Fair value | $ 37,893 | $ 18,193
Less than 12 months, Gross unrealized loss | 237 | 49
12 months or greater, Fair value | 73,923 | 86,643
12 months or greater, Gross unrealized loss | $ 3,148 | $ 3,928

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