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Note 7 - Marketable Securities - Short-term and Long-term Marketable Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Amortized Cost	$ 90,785	$ 94,458
Unrealized Gains
Unrealized Losses	(412)	(463)
Fair Value	90,373	93,995
Bank Time Deposits [Member]
Amortized Cost	4,456	3,968
Unrealized Gains
Unrealized Losses	(29)	(32)
Fair Value	4,427	3,936
US States and Political Subdivisions Debt Securities [Member]
Amortized Cost	20,607	28,364
Unrealized Gains
Unrealized Losses	(74)	(104)
Fair Value	20,533	28,260
Corporate Debt Securities [Member]
Amortized Cost	43,525	29,806
Unrealized Gains
Unrealized Losses	(153)	(128)
Fair Value	43,372	29,678
US Government Agencies Debt Securities [Member]
Amortized Cost	22,197	32,320
Unrealized Gains
Unrealized Losses	(156)	(199)
Fair Value	$ 22,041	$ 32,121

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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