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Note 4 - Fair Value Measurements - Financial Assets Measured on a Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Available-for-sale, current	$ 83,981	$ 37,724
US Government Agencies Debt Securities [Member]
Available-for-sale, current	19,981
Domestic Corporate Debt Securities [Member]
Available-for-sale, current	12,590	12,039
Foreign Corporate Debt Securities [Member]
Available-for-sale, current		14,057
United States Commercial Paper [Member]
Available-for-sale, current	25,450	8,635
Foreign Commercial Paper [Member]
Available-for-sale, current	25,960	2,993
Fair Value, Measurements, Recurring [Member]
Assets, fair value	105,771	49,217
Money market funds	21,790	11,493
Fair Value, Measurements, Recurring [Member] | US Government Agencies Debt Securities [Member]
Available-for-sale, current	19,981
Fair Value, Measurements, Recurring [Member] | Domestic Corporate Debt Securities [Member]
Available-for-sale, current	12,590	12,039
Fair Value, Measurements, Recurring [Member] | Foreign Corporate Debt Securities [Member]
Available-for-sale, current		14,057
Fair Value, Measurements, Recurring [Member] | United States Commercial Paper [Member]
Available-for-sale, current	25,450	8,635
Fair Value, Measurements, Recurring [Member] | Foreign Commercial Paper [Member]
Available-for-sale, current	25,960	2,993
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Assets, fair value	26,787	11,493
Money market funds	21,790	11,493
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | US Government Agencies Debt Securities [Member]
Available-for-sale, current	4,997
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Domestic Corporate Debt Securities [Member]
Available-for-sale, current
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Foreign Corporate Debt Securities [Member]
Available-for-sale, current
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | United States Commercial Paper [Member]
Available-for-sale, current
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Foreign Commercial Paper [Member]
Available-for-sale, current
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Assets, fair value	78,984	37,724
Money market funds
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | US Government Agencies Debt Securities [Member]
Available-for-sale, current	14,984
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Domestic Corporate Debt Securities [Member]
Available-for-sale, current	12,590	12,039
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Foreign Corporate Debt Securities [Member]
Available-for-sale, current		14,057
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | United States Commercial Paper [Member]
Available-for-sale, current	25,450	8,635
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Foreign Commercial Paper [Member]
Available-for-sale, current	25,960	2,993
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Assets, fair value
Money market funds
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | US Government Agencies Debt Securities [Member]
Available-for-sale, current
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Domestic Corporate Debt Securities [Member]
Available-for-sale, current
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Foreign Corporate Debt Securities [Member]
Available-for-sale, current
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | United States Commercial Paper [Member]
Available-for-sale, current
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Foreign Commercial Paper [Member]
Available-for-sale, current

X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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X

- Definition

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

+ 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 50
-Paragraph 5
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=82897076&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=82896770&loc=d3e26610-111562

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X

- Definition

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

No definition available.

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