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Note 6 - Marketable Securities - Available-for-sale Marketable Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Available-for-sale - matures within one year, Amortized cost	$ 17,245	$ 6,094
Available-for-sale - matures within one year, Gross unrealized gains	13
Available-for-sale - matures within one year, Gross unrealized losses	(30)	(32)
Available-for-sale - matures within one year, Fair value	17,228	6,062
Available-for-sale - matures after one year through five years, Amortized cost	53,271	72,598
Available-for-sale - matures after one year through five years, Gross unrealized gains	162	134
Available-for-sale - matures after one year through five years, Gross unrealized losses	(199)	(1,325)
Available-for-sale - matures after one year through five years, Fair value	53,234	71,407
Available-for-sale, Amortized cost	70,516	78,692
Available-for-sale, Gross unrealized gains	175	134
Available-for-sale, Gross unrealized losses	(229)	(1,357)
Marketable securities	70,462	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		747
Corporate Bonds [Member]
Available-for-sale - matures within one year, Amortized cost	17,245	6,094
Available-for-sale - matures within one year, Gross unrealized gains	13
Available-for-sale - matures within one year, Gross unrealized losses	(30)	(32)
Available-for-sale - matures within one year, Fair value	17,228	6,062
Available-for-sale - matures after one year through five years, Amortized cost	52,770	71,350
Available-for-sale - matures after one year through five years, Gross unrealized gains	162	134
Available-for-sale - matures after one year through five years, Gross unrealized losses	(198)	(1,320)
Available-for-sale - matures after one year through five years, Fair value	52,734	70,164
Government Bonds [Member]
Available-for-sale - matures after one year through five years, Amortized cost	501	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	(1)	(5)
Available-for-sale - matures after one year through five years, Fair value	$ 500	$ 496

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