Note 6 - Marketable Securities - Marketable Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-Sale, Amortized Cost	$ 5,254	$ 5,113
Debt Securities, Available-for-Sale, Gross Unrealized Gains	157
Debt Securities, Available-for-Sale, Gross Unrealized Losses	(1)
Debt Securities, Available-for-Sale	$ 5,410	$ 5,230

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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+ Details