Note 3 - Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2016

Notes Tables

Fair Value, Assets Measured on Recurring Basis [Table Text Block]

	As of March 31, 2016
	Quoted Prices		Significant		Significant
	in Active		Observable		Unobservable
	Markets		Inputs		Inputs
	(Level 1)		(Level 2)		(Level 3)		Total
Assets
Cash equivalents	$	22,873	$	-	$	-	$	22,873
Government securities		35,326		-		-		35,326
Total	$	58,199	$	-	$	-	$	58,199
Liabilities
Foreign currency forward contracts	$	-	$	319	$	-	$	319
Total	$	-	$	319	$	-	$	319

	As of December 31, 2015
	Quoted Prices		Significant		Significant
	in Active		Observable		Unobservable
	Markets		Inputs		Inputs
	(Level 1)		(Level 2)		(Level 3)		Total
Assets
Cash equivalents	$	39,233	$	-	$	-	$	39,233
Government securities		25,232		-		-		25,232
Total	$	64,465	$	-	$	-	$	64,465
Liabilities
Foreign currency forward contracts	$	-	$	537	$	-	$	537
Total	$	-	$	537	$	-	$	537

Available-for-sale Securities [Table Text Block]

	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
March 31, 2016
Government securities
(Due within 1 year)	$	35,314	$	13	$	(1	)	$	35,326
	$	35,314	$	13	$	(1	)	$	35,326
December 31, 2015
Government securities
(Due within 1 year)	$	25,243	$	1	$	(12	)	$	25,232
	$	25,243	$	1	$	(12	)	$	25,232