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Note 5 - Marketable Securities - Available-for-sale Marketable Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Available-for-sale - matures within one year, Amortized cost	$ 14,334	$ 6,094
Available-for-sale - matures within one year, Gross unrealized gains	3
Available-for-sale - matures within one year, Gross unrealized losses	(41)	(32)
Available-for-sale - matures within one year, Fair value	14,296	6,062
Available-for-sale - matures after one year through five years, Amortized cost	61,753	72,598
Available-for-sale - matures after one year through five years, Gross unrealized gains	265	134
Available-for-sale - matures after one year through five years, Gross unrealized losses	(191)	(1,325)
Available-for-sale - matures after one year through five years, Fair value	61,827	71,407
Available-for-sale, Amortized cost	76,087	78,692
Available-for-sale, Gross unrealized gains	268	134
Available-for-sale, Gross unrealized losses	(232)	(1,357)
Marketable securities	76,123	77,469
Certificates of Deposits [Member]
Available-for-sale - matures after one year through five years, Amortized cost	747	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	747
Marketable securities	747	747
Corporate Bonds [Member]
Available-for-sale - matures within one year, Amortized cost	14,334	6,094
Available-for-sale - matures within one year, Gross unrealized gains	3
Available-for-sale - matures within one year, Gross unrealized losses	(41)	(32)
Available-for-sale - matures within one year, Fair value	14,296	6,062
Available-for-sale - matures after one year through five years, Amortized cost	60,505	71,350
Available-for-sale - matures after one year through five years, Gross unrealized gains	265	134
Available-for-sale - matures after one year through five years, Gross unrealized losses	(190)	(1,320)
Available-for-sale - matures after one year through five years, Fair value	60,580	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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