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Note 7 - Marketable Securities - Summary of Gross Unrealized Losses and Fair Values on Investments (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Less than 12 months, Fair value | $ 26,887 | $ 58,706
Less than 12 months, Gross unrealized loss | (427) | (1,885)
12 months or greater, Fair value | 75,779 | 48,539
12 months or greater, Gross unrealized loss | $ (5,392) | $ (4,980)

X
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