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Note 4 - Balance Sheet Details - Available-for-sale Securities (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Available-for-sale securities, amortized cost	$ 37,741,000	$ 56,026,000
Available-for-sale securities, gross unrealized losses	(17,000)	(40,000)
Short-term investments	37,724,000	55,986,000
Domestic Corporate Debt Securities [Member]
Available-for-sale securities, amortized cost	12,048,000	27,750,000
Available-for-sale securities, gross unrealized losses	(9,000)	(35,000)
Short-term investments	12,039,000	27,715,000
Foreign Corporate Debt Securities [Member]
Available-for-sale securities, amortized cost	14,065,000	4,927,000
Available-for-sale securities, gross unrealized losses	(8,000)	(5,000)
Short-term investments	14,057,000	4,922,000
United States Commercial Paper [Member]
Available-for-sale securities, amortized cost	8,635,000	7,770,000
Short-term investments	8,635,000	7,770,000
Foreign Commercial Paper [Member]
Available-for-sale securities, amortized cost	2,993,000	15,579,000
Short-term investments	$ 2,993,000	$ 15,579,000

X

- Definition

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ 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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X

- Definition

Amount of investment in debt and equity securities categorized neither as trading securities nor held-to-maturity securities and intended be sold or mature one year or operating cycle, if longer.

+ References

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 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26626-111562

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X

- Definition

Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563

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