Note 5 - Marketable Securities - Available-for-sale Marketable Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Available-for-sale - matures within one year, Amortized cost	$ 9,358	$ 6,094
Available-for-sale - matures within one year, Gross unrealized gains	2
Available-for-sale - matures within one year, Gross unrealized losses	(46)	(32)
Available-for-sale - matures within one year, Fair value	9,314	6,062
Available-for-sale - matures after one year through five years, Amortized cost	68,789	72,598
Available-for-sale - matures after one year through five years, Gross unrealized gains	129	134
Available-for-sale - matures after one year through five years, Gross unrealized losses	(645)	(1,325)
Available-for-sale - matures after one year through five years, Fair value	68,273	71,407
Available-for-sale, Amortized cost	78,147	78,692
Available-for-sale, Gross unrealized gains	131	134
Available-for-sale, Gross unrealized losses	(691)	(1,357)
Marketable securities	77,587	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	9,358	6,094
Available-for-sale - matures within one year, Gross unrealized gains	2
Available-for-sale - matures within one year, Gross unrealized losses	(46)	(32)
Available-for-sale - matures within one year, Fair value	9,314	6,062
Available-for-sale - matures after one year through five years, Amortized cost	67,541	71,350
Available-for-sale - matures after one year through five years, Gross unrealized gains	129	134
Available-for-sale - matures after one year through five years, Gross unrealized losses	(642)	(1,320)
Available-for-sale - matures after one year through five years, Fair value	67,028	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	(3)	(5)
Available-for-sale - matures after one year through five years, Fair value	$ 498	$ 496

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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