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Note 9 - Investments in Marketable Securities - Amortized Cost and Estimated Fair Value of Debt Securities as Available for Sale (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Within 1 year, cost | $ 24,655 | $ 25,707
Within 1 year, fair value | 24,424 | 25,317
1 to 5 years, cost | 66,455 | 66,117
1 to 5 years, fair value | 64,280 | 63,379
6 to 10 years, cost | 32,208 | 32,648
6 to 10 years, fair value | 31,019 | 30,606
Over 10 years, cost | 570 | 646
Over 10 years, fair value | 444 | 502
Cost | 123,888 | 125,118
Fair Value | $ 120,167 | $ 119,804

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