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Note 5 - Marketable Securities - Available-for-sale Marketable Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Marketable securities	$ 92,625	$ 90,298
Corporate Bonds [Member]
Available-for-sale - matures within one year, Amortized cost	11,089	11,937
Available-for-sale - matures within one year, Gross unrealized gains	6	39
Available-for-sale - matures within one year, Gross unrealized losses	(7)	(7)
Available-for-sale - matures within one year, Fair value	11,088	11,969
Available-for-sale - matures after one year through five years, Amortized cost	84,934	78,920
Available-for-sale - matures after one year through five years, Gross unrealized gains	15	227
Available-for-sale - matures after one year through five years, Gross unrealized losses	(3,412)	(818)
Available-for-sale - matures after one year through five years, Fair value	81,537	78,329
Available-for-sale, Amortized cost	96,023	90,857
Available-for-sale, Gross unrealized gains	21	266
Available-for-sale, Gross unrealized losses	(3,419)	(825)
Marketable securities	$ 92,625	$ 90,298

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