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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, 2024	Dec. 31, 2023
Within 1 year, cost	$ 21,299	$ 19,664
Within 1 year, fair value	20,785	19,328
1 to 5 years, cost	77,738	81,517
1 to 5 years, fair value	73,370	77,118
6 to 10 years, cost	32,012	33,515
6 to 10 years, fair value	28,925	30,802
Over 10 years, cost	1,361	642
Over 10 years, fair value	1,236	479
Cost	132,410	135,338
Fair Value	$ 124,316	$ 127,727

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