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Note 3 - Marketable Securities - Available-for-sale Marketable Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Marketable securities	$ 90,298	$ 88,754
Corporate Bonds [Member]
Available-for-sale - matures within one year, Amortized cost	11,937	12,667
Available-for-sale - matures within one year, Gross unrealized gains	39	49
Available-for-sale - matures within one year, Gross unrealized losses	(7)	(7)
Available-for-sale - matures within one year, Fair value	11,969	12,709
Available-for-sale - matures after one year through five years, Amortized cost	78,920	75,483
Available-for-sale - matures after one year through five years, Gross unrealized gains	227	667
Available-for-sale - matures after one year through five years, Gross unrealized losses	(818)	(105)
Available-for-sale - matures after one year through five years, Fair value	78,329	76,045
Available-for-sale, Amortized cost	90,857	88,150
Available-for-sale, Gross unrealized gains	266	716
Available-for-sale, Gross unrealized losses	(825)	(112)
Marketable securities	$ 90,298	$ 88,754

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