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Note 3 - Fair Value Measurements - Financial Assets Measured on a Recurring Basis (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Total	$ 168,623	$ 49,217
Foreign Commercial Paper [Member]
Available-for-sale securities	19,854
Domestic Corporate Debt Securities [Member]
Available-for-sale securities	17,520	12,039
United States Commercial Paper [Member]
Available-for-sale securities	39,863	8,635
Foreign Corporate Debt Securities [Member]
Available-for-sale securities		14,057
Foreign Commercial Paper [Member]
Available-for-sale securities		2,993
Fair Value, Inputs, Level 1 [Member]
Total	91,386	11,493
Fair Value, Inputs, Level 1 [Member] | Domestic Corporate Debt Securities [Member]
Available-for-sale securities
Fair Value, Inputs, Level 1 [Member] | United States Commercial Paper [Member]
Available-for-sale securities
Fair Value, Inputs, Level 1 [Member] | Foreign Corporate Debt Securities [Member]
Available-for-sale securities
Fair Value, Inputs, Level 1 [Member] | Foreign Commercial Paper [Member]
Available-for-sale securities
Fair Value, Inputs, Level 2 [Member]
Total	77,237	37,724
Fair Value, Inputs, Level 2 [Member] | Domestic Corporate Debt Securities [Member]
Available-for-sale securities	17,520	12,039
Fair Value, Inputs, Level 2 [Member] | United States Commercial Paper [Member]
Available-for-sale securities	39,863	8,635
Fair Value, Inputs, Level 2 [Member] | Foreign Corporate Debt Securities [Member]
Available-for-sale securities		14,057
Fair Value, Inputs, Level 2 [Member] | Foreign Commercial Paper [Member]
Available-for-sale securities	19,854	2,993
Fair Value, Inputs, Level 3 [Member]
Total
Fair Value, Inputs, Level 3 [Member] | Domestic Corporate Debt Securities [Member]
Available-for-sale securities
Fair Value, Inputs, Level 3 [Member] | United States Commercial Paper [Member]
Available-for-sale securities
Fair Value, Inputs, Level 3 [Member] | Foreign Corporate Debt Securities [Member]
Available-for-sale securities
Fair Value, Inputs, Level 3 [Member] | Foreign Commercial Paper [Member]
Available-for-sale securities
Money Market Funds [Member]
Money market funds	91,386	11,493
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Money market funds	91,386	11,493
Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Money market funds
Money Market Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Money market funds

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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- 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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