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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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