Note 3 - Marketable Securities and Time Deposits (Details) - Marketable Securities and Time Deposits - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Marketable securities and time deposits, amortized cost	$ 108,285	$ 104,073
Marketable securities and time deposits, unrealized gains (losses), net	(501)	(296)
Marketable securities and time deposits, estimated fair value	107,784	103,777
Short-term Deposits [Member]
Schedule of Available-for-sale Securities [Line Items]
Marketable securities and time deposits, amortized cost	5,568	2,599
Marketable securities and time deposits, unrealized gains (losses), net	0	0
Marketable securities and time deposits, estimated fair value	5,568	2,599
US Government-sponsored Enterprises Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Marketable securities and time deposits, amortized cost	23,645	21,085
Marketable securities and time deposits, unrealized gains (losses), net	(114)	(34)
Marketable securities and time deposits, estimated fair value	23,531	21,051
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Marketable securities and time deposits, amortized cost	79,072	80,389
Marketable securities and time deposits, unrealized gains (losses), net	(387)	(262)
Marketable securities and time deposits, estimated fair value	$ 78,685	$ 80,127

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26610-111562

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.2)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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