Note 2 - Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2018

Notes Tables

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

	As of March 31, 2018 (unaudited)										As of December 31, 2017
	Level I		Level II			Level III		Fair Value			Level I		Level II		Level III		Fair Value
Financial assets:
Cash equivalents:
Money market funds		9,029		–			–		9,029			6,870		–		–		6,870
Short-term investments:
US Treasury securities		37,717		–			–		37,717			39,731		–		–		39,731
Term bank deposits		45,175		–			–		45,175			40,137		–		–		40,137
Other current assets:
Forward foreign exchange contracts		–		–			–		–			–		163		–		163
Financial liabilities:
Forward foreign exchange contracts		–		(2,029	)		–		(2,029	)		–		–		–		–
Total financial assets (liabilities)	$	91,921	$	(2,029	)	$	–	$	89,892		$	86,738	$	163	$	–	$	86,901