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Note 5 - Marketable Securities - Available-for-sale Marketable Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Marketable securities	$ 100,701	$ 90,298
Corporate Bonds [Member]
Available-for-sale - matures within one year, Amortized cost	18,390	11,937
Available-for-sale - matures within one year, Gross unrealized gains	0	39
Available-for-sale - matures within one year, Gross unrealized losses	(722)	(7)
Available-for-sale - matures within one year, Fair value	17,668	11,969
Available-for-sale - matures after one year through five years, Amortized cost	89,396	78,920
Available-for-sale - matures after one year through five years, Gross unrealized gains	0	227
Available-for-sale - matures after one year through five years, Gross unrealized losses	(6,363)	(818)
Available-for-sale - matures after one year through five years, Fair value	83,033	78,329
Available-for-sale, Amortized cost	107,786	90,857
Available-for-sale, Gross unrealized gains	0	266
Available-for-sale, Gross unrealized losses	(7,085)	(825)
Marketable securities	$ 100,701	$ 90,298

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