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Note 7 - Marketable Securities - Summary of Gross Unrealized Losses and Fair Values on Investments (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Less than 12 months, Fair value | $ 12,074 | $ 28,762
Less than 12 months, Gross unrealized loss | (38) | (160)
12 months or greater, Fair value | 30,366 | 61,996
12 months or greater, Gross unrealized loss | $ (566) | $ (1,589)

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