Note 4 - Marketable Securities and Time Deposits (Details) - Marketable Securities and Time Deposits - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Marketable securities and time deposits, amortized cost	$ 104,992	$ 108,285
Marketable securities and time deposits, unrealized gains (losses), net	(62)	(501)
Marketable securities and time deposits, estimated fair value	104,930	107,784
Short-term Deposits [Member]
Schedule of Available-for-sale Securities [Line Items]
Marketable securities and time deposits, amortized cost	5,674	5,568
Marketable securities and time deposits, unrealized gains (losses), net	0	0
Marketable securities and time deposits, estimated fair value	5,674	5,568
US Government-sponsored Enterprises Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Marketable securities and time deposits, amortized cost	22,562	23,645
Marketable securities and time deposits, unrealized gains (losses), net	(35)	(114)
Marketable securities and time deposits, estimated fair value	22,527	23,531
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Marketable securities and time deposits, amortized cost	76,756	79,072
Marketable securities and time deposits, unrealized gains (losses), net	(27)	(387)
Marketable securities and time deposits, estimated fair value	$ 76,729	$ 78,685

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=65884222&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=73527792&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=66010992&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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