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Note 7 - Marketable Securities - Short-term and Long-term Marketable Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Amortized Cost	$ 84,134	$ 94,458
Unrealized Gains
Unrealized Losses	(536)	(463)
Fair Value	83,598	93,995
Bank Time Deposits [Member]
Amortized Cost	3,968	3,968
Unrealized Gains
Unrealized Losses	(39)	(32)
Fair Value	3,929	3,936
US States and Political Subdivisions Debt Securities [Member]
Amortized Cost	23,417	28,364
Unrealized Gains
Unrealized Losses	(96)	(104)
Fair Value	23,321	28,260
Corporate Debt Securities [Member]
Amortized Cost	24,377	29,806
Unrealized Gains
Unrealized Losses	(194)	(128)
Fair Value	24,183	29,678
US Government Agencies Debt Securities [Member]
Amortized Cost	32,372	32,320
Unrealized Gains
Unrealized Losses	(207)	(199)
Fair Value	$ 32,165	$ 32,121

X

- Definition

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

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

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-Name Accounting Standards Codification
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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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