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Note 4 - Available-for-sale Securities (Details)	12 Months Ended
	Dec. 31, 2015 USD ($)
Domestic Corporate Debt Securities [Member]
Available-for-sale securities, amortized cost	$ 28,750,000
Available-for-sale Securities, Gross Unrealized Gain
Net unrealized loss on short-term investments	$ (35,000)
Available-for-sale Securities, Current	28,715,000
Foreign Corporate Debt Securities [Member]
Available-for-sale securities, amortized cost	$ 4,927,000
Available-for-sale Securities, Gross Unrealized Gain
Net unrealized loss on short-term investments	$ (5,000)
Available-for-sale Securities, Current	4,922,000
United States Commercial Paper [Member]
Available-for-sale securities, amortized cost	$ 7,770,000
Available-for-sale Securities, Gross Unrealized Gain
Net unrealized loss on short-term investments
Available-for-sale Securities, Current	$ 7,770,000
Foreign Commercial Paper [Member]
Available-for-sale securities, amortized cost	$ 15,579,000
Available-for-sale Securities, Gross Unrealized Gain
Net unrealized loss on short-term investments
Available-for-sale Securities, Current	$ 15,579,000
Available-for-sale securities, amortized cost	$ 57,026,000
Available-for-sale Securities, Gross Unrealized Gain
Net unrealized loss on short-term investments	$ (40,000)
Available-for-sale Securities, Current	$ 55,986,000

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

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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=51813488&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=49167202&loc=d3e26626-111562

+ Details

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Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as 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 (b)
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	duration

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=27724398&loc=d3e27161-111563

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Namespace Prefix:	us-gaap_
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Period Type:	duration

X

- Details

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Namespace Prefix:
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X

- Details

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