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Note 3 - Marketable Securities - Available-for-sale Marketable Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Available-for-sale - matures within one year, Amortized cost	$ 6,094	$ 11,803
Available-for-sale - matures within one year, Gross unrealized gains		3
Available-for-sale - matures within one year, Gross unrealized losses	(32)	(12)
Available-for-sale - matures within one year, Fair value	6,062	11,794
Available-for-sale - matures after one year through five years, Amortized cost	72,598	71,539
Available-for-sale - matures after one year through five years, Gross unrealized gains	134	14
Available-for-sale - matures after one year through five years, Gross unrealized losses	(1,325)	(683)
Available-for-sale - matures after one year through five years, Fair value	71,407	70,870
Available-for-sale, Amortized cost	78,692	83,342
Available-for-sale, Gross unrealized gains	134	17
Available-for-sale, Gross unrealized losses	(1,357)	(695)
Marketable securities (Note 3)	77,469	82,664
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 (Note 3)	747	747
Corporate Bonds [Member]
Available-for-sale - matures within one year, Amortized cost	6,094	11,803
Available-for-sale - matures within one year, Gross unrealized gains		3
Available-for-sale - matures within one year, Gross unrealized losses	(32)	(12)
Available-for-sale - matures within one year, Fair value	6,062	11,794
Available-for-sale - matures after one year through five years, Amortized cost	71,350	70,291
Available-for-sale - matures after one year through five years, Gross unrealized gains	134	14
Available-for-sale - matures after one year through five years, Gross unrealized losses	(1,320)	(677)
Available-for-sale - matures after one year through five years, Fair value	70,164	69,628
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	(5)	(6)
Available-for-sale - matures after one year through five years, Fair value	$ 496	$ 495

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