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Note 3 - Marketable Securities - Available-for-sale Marketable Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Available-for-sale - matures within one year, Amortized cost	$ 18,224	$ 6,094
Available-for-sale - matures within one year, Gross unrealized gains	16
Available-for-sale - matures within one year, Gross unrealized losses	(11)	(32)
Available-for-sale - matures within one year, Fair value	18,229	6,062
Available-for-sale - matures after one year through five years, Amortized cost	46,593	72,598
Available-for-sale - matures after one year through five years, Gross unrealized gains	168	134
Available-for-sale - matures after one year through five years, Gross unrealized losses	(123)	(1,325)
Available-for-sale - matures after one year through five years, Fair value	46,638	71,407
Available-for-sale, Amortized cost	64,817	78,692
Available-for-sale, Gross unrealized gains	184	134
Available-for-sale, Gross unrealized losses	(134)	(1,357)
Marketable securities (Note 3)	64,867	77,469
Certificates of Deposits [Member]
Available-for-sale - matures after one year through five years, Amortized cost		747
Available-for-sale - matures after one year through five years, Gross unrealized gains
Available-for-sale - matures after one year through five years, Gross unrealized losses
Available-for-sale - matures after one year through five years, Fair value		747
Marketable securities (Note 3)		747
Corporate Bonds [Member]
Available-for-sale - matures within one year, Amortized cost	18,224	6,094
Available-for-sale - matures within one year, Gross unrealized gains	16
Available-for-sale - matures within one year, Gross unrealized losses	(11)	(32)
Available-for-sale - matures within one year, Fair value	18,229	6,062
Available-for-sale - matures after one year through five years, Amortized cost	46,593	71,350
Available-for-sale - matures after one year through five years, Gross unrealized gains	168	134
Available-for-sale - matures after one year through five years, Gross unrealized losses	(123)	(1,320)
Available-for-sale - matures after one year through five years, Fair value	$ 46,638	70,164
Government Bonds [Member]
Available-for-sale - matures after one year through five years, Amortized cost		501
Available-for-sale - matures after one year through five years, Gross unrealized gains
Available-for-sale - matures after one year through five years, Gross unrealized losses		(5)
Available-for-sale - matures after one year through five years, Fair value		$ 496

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