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Note 7 - Marketable Securities - Short-term and Long-term Marketable Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Amortized Cost	$ 94,458	$ 123,956
Unrealized Gains		16
Unrealized Losses	(463)	(497)
Fair Value	93,995	123,475
Bank Time Deposits [Member]
Amortized Cost	3,968	7,182
Unrealized Gains		12
Unrealized Losses	(32)	(22)
Fair Value	3,936	7,172
US Government Agencies Debt Securities [Member]
Amortized Cost	32,320	31,706
Unrealized Gains		1
Unrealized Losses	(199)	(141)
Fair Value	32,121	31,566
Corporate Debt Securities [Member]
Amortized Cost	29,806	38,490
Unrealized Gains		2
Unrealized Losses	(128)	(147)
Fair Value	29,678	38,345
US States and Political Subdivisions Debt Securities [Member]
Amortized Cost	28,364	46,578
Unrealized Gains		1
Unrealized Losses	(104)	(187)
Fair Value	$ 28,260	$ 46,392

X

- Definition

Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

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