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Note 8 - Marketable Securities - Short-term and Long-term Marketable Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Amortized Cost	$ 70,329	$ 94,458
Unrealized Gains	1
Unrealized Losses	(242)	(463)
Fair Value	70,088	93,995
Bank Time Deposits [Member]
Amortized Cost	4,208	3,968
Unrealized Gains
Unrealized Losses	(25)	(32)
Fair Value	4,183	3,936
US Government Agencies Debt Securities [Member]
Amortized Cost	16,843	32,320
Unrealized Gains
Unrealized Losses	(88)	(199)
Fair Value	16,755	32,121
Corporate Debt Securities [Member]
Amortized Cost	31,769	29,806
Unrealized Gains
Unrealized Losses	(96)	(128)
Fair Value	31,673	29,678
US States and Political Subdivisions Debt Securities [Member]
Amortized Cost	17,509	28,364
Unrealized Gains	1
Unrealized Losses	(33)	(104)
Fair Value	$ 17,477	$ 28,260

X

- Definition

Amount of investment in debt security measured at amortized cost (held-to-maturity).

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Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity).

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