Note 4 - Investments in Debt Securities - Amortized Cost and Fair Value of Investments in Debt Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Investment in debt securities, amortized cost	$ 17,778	$ 14,338
Investment in debt securities, fair value	18,064	14,390
US Treasury and Government [Member]
Investment in debt securities, amortized cost	14,888	9,733
Investment in debt securities, fair value	15,133	9,838
Corporate Debt Securities [Member]
Investment in debt securities, amortized cost	2,890	4,605
Investment in debt securities, fair value	$ 2,931	$ 4,552

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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