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Note 6 - Marketable Securities - Available-for-sale Marketable Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Available-for-sale, Amortized cost		$ 88,150
Available-for-sale, Gross unrealized gains		716
Available-for-sale, Gross unrealized losses		(112)
Marketable securities	$ 75,324	88,754
Corporate Bonds [Member]
Available-for-sale - matures within one year, Amortized cost	10,269	12,667
Available-for-sale - matures within one year, Gross unrealized gains	37	49
Available-for-sale - matures within one year, Gross unrealized losses	(1)	(7)
Available-for-sale - matures within one year, Fair value	10,305	12,709
Available-for-sale - matures after one year through five years, Amortized cost	64,750	75,483
Available-for-sale - matures after one year through five years, Gross unrealized gains	528	667
Available-for-sale - matures after one year through five years, Gross unrealized losses	(259)	(105)
Available-for-sale - matures after one year through five years, Fair value	65,019	$ 76,045
Available-for-sale, Amortized cost	75,019
Available-for-sale, Gross unrealized gains	565
Available-for-sale, Gross unrealized losses	(260)
Marketable securities	$ 75,324

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