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Note 3 - Marketable Securities - Available-for-sale Marketable Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Available-for-sale, Amortized cost	$ 88,150	$ 64,817
Available-for-sale, Gross unrealized gains	716	184
Available-for-sale, Gross unrealized losses	(112)	(134)
Marketable securities	88,754	64,867
Corporate Bonds [Member]
Available-for-sale - matures within one year, Amortized cost	12,667	18,224
Available-for-sale - matures within one year, Gross unrealized gains	49	16
Available-for-sale - matures within one year, Gross unrealized losses	(7)	(11)
Available-for-sale - matures within one year, Fair value	12,709	18,229
Available-for-sale - matures after one year through five years, Amortized cost	75,483	46,593
Available-for-sale - matures after one year through five years, Gross unrealized gains	667	168
Available-for-sale - matures after one year through five years, Gross unrealized losses	(105)	(123)
Available-for-sale - matures after one year through five years, Fair value	$ 76,045	$ 46,638

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