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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	Jun. 30, 2024	Dec. 31, 2023
Within 1 year, cost	$ 20,602	$ 19,664
Within 1 year, fair value	20,058	19,328
1 to 5 years, cost	71,239	81,517
1 to 5 years, fair value	67,679	77,118
6 to 10 years, cost	34,007	33,515
6 to 10 years, fair value	31,582	30,802
Over 10 years, cost	613	642
Over 10 years, fair value	476	479
Cost	126,461	135,338
Fair Value	$ 119,795	$ 127,727

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