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Note 4 - Balance Sheet Details - Available-for-sale Securities (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Available-for-sale securities, amortized cost	$ 27,806,000	$ 37,741,000
Available-for-sale securities, gross unrealized losses	(10,000)	(17,000)	$ (40,000)
Available-for-sale securities, current	27,796,000	37,724,000
Domestic Corporate Debt Securities [Member]
Available-for-sale securities, amortized cost	13,003,000	12,048,000
Available-for-sale securities, gross unrealized losses	(10,000)	(9,000)
Available-for-sale securities, current	12,993,000	12,039,000
United States Commercial Paper [Member]
Available-for-sale securities, amortized cost	4,929,000	8,635,000
Available-for-sale securities, gross unrealized losses
Available-for-sale securities, current	4,929,000	8,635,000
Foreign Corporate Debt Securities [Member]
Available-for-sale securities, amortized cost		14,065,000
Available-for-sale securities, gross unrealized losses		(8,000)
Available-for-sale securities, current		14,057,000
Foreign Commercial Paper [Member]
Available-for-sale securities, amortized cost	9,874,000	2,993,000
Available-for-sale securities, gross unrealized losses
Available-for-sale securities, current	$ 9,874,000	$ 2,993,000

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=75030427&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=82896770&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=82897076&loc=d3e27161-111563

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