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Note 3 - Marketable Securities - Available-for-sale Marketable Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Marketable securities	$ 112,080	$ 90,298
Corporate Bonds [Member]
Available-for-sale - matures within one year, Amortized cost	17,552	11,937
Available-for-sale - matures within one year, Gross unrealized gains	0	39
Available-for-sale - matures within one year, Gross unrealized losses	(1,330)	(7)
Available-for-sale - matures within one year, Fair value	16,222	11,969
Available-for-sale - matures after one year through five years, Amortized cost	101,355	78,920
Available-for-sale - matures after one year through five years, Gross unrealized gains	38	227
Available-for-sale - matures after one year through five years, Gross unrealized losses	(5,535)	(818)
Available-for-sale - matures after one year through five years, Fair value	95,858	78,329
Available-for-sale, Amortized cost	118,907	90,857
Total	38	266
Total	(6,865)	(825)
Marketable securities	$ 112,080	$ 90,298

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