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Note 3 - Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2017

Notes Tables

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

						Fair Value Measurements at Reporting Date Using
		Balance at December 31 , 2017				Quoted Prices in Active Markets for Identical Assets (Level 1)				Significant Other Observable Inputs (Level 2)				Significant Unobservable Inputs (Level 3)
Money market funds		$	91,386			$	91,386			$	—			$	—
U.S. corporate debt securities			17,520				—				17,520				—
U.S. commercial paper			39,863				—				39,863				—
Foreign commercial paper			19,854				—				19,854				—
Total		$	168,623			$	91,386			$	77,237			$	—

						Fair Value Measurements at Reporting Date Using
		Balance at December 31 , 2016				Quoted Prices in Active Markets for Identical Assets (Level 1)				Significant Other Observable Inputs (Level 2)				Significant Unobservable Inputs (Level 3)
Money market funds		$	11,493			$	11,493			$	—			$	—
U.S. corporate debt securities			12,039				—				12,039				—
Foreign corporate debt securities			14,057				—				14,057				—
U.S. commercial paper			8,635				—				8,635				—
Foreign commercial paper			2,993				—				2,993				—
Total		$	49,217			$	11,493			$	37,724			$	—

X

- Definition

Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258

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- References

No definition available.

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