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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	Sep. 30, 2025	Dec. 31, 2024
Within 1 year, cost	$ 17,348	$ 25,707
Within 1 year, fair value	17,010	25,317
1 to 5 years, cost	51,371	66,117
1 to 5 years, fair value	51,167	63,379
6 to 10 years, cost	38,826	32,648
6 to 10 years, fair value	39,123	30,606
Over 10 years, cost	16,476	646
Over 10 years, fair value	15,612	502
Cost	124,021	125,118
Fair Value	$ 122,912	$ 119,804

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