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Note 4 - Fair Value Measurements - Financial Assets Measured on a Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Available-for-sale securities	$ 67,363	$ 27,796
Debt Security, Corporate, US [Member]
Available-for-sale securities	16,160	12,993
United States Commercial Paper [Member]
Available-for-sale securities	17,402	4,929
Foreign Commercial Paper [Member]
Available-for-sale securities	33,801	9,874
Fair Value, Measurements, Recurring [Member]
Total	108,086	168,623
Fair Value, Measurements, Recurring [Member] | Foreign Commercial Paper [Member]
Available-for-sale securities	36,641
Fair Value, Measurements, Recurring [Member] | Debt Security, Corporate, US [Member]
Available-for-sale securities	16,160	17,520
Fair Value, Measurements, Recurring [Member] | United States Commercial Paper [Member]
Available-for-sale securities	17,402	39,863
Fair Value, Measurements, Recurring [Member] | Foreign Commercial Paper [Member]
Available-for-sale securities		19,854
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Total	37,883	91,386
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Debt Security, Corporate, US [Member]
Available-for-sale securities
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | United States Commercial Paper [Member]
Available-for-sale securities
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Foreign Commercial Paper [Member]
Available-for-sale securities
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Total	70,203	77,237
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Security, Corporate, US [Member]
Available-for-sale securities	16,160	17,520
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | United States Commercial Paper [Member]
Available-for-sale securities	17,402	39,863
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Foreign Commercial Paper [Member]
Available-for-sale securities	36,641	19,854
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Total
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Debt Security, Corporate, US [Member]
Available-for-sale securities
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | United States Commercial Paper [Member]
Available-for-sale securities
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Foreign Commercial Paper [Member]
Available-for-sale securities
Fair Value, Measurements, Recurring [Member] | Money Market Funds [Member]
Money market funds	37,883	91,386
Fair Value, Measurements, Recurring [Member] | Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Money market funds	37,883	91,386
Fair Value, Measurements, Recurring [Member] | Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Money market funds
Fair Value, Measurements, Recurring [Member] | 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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

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- Definition

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

+ References

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- Definition

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+ References

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