Note 3 - Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2015

Notes Tables

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

	As of June 30, 2015
	Quoted Prices in Active Markets (Level 1)		Significant Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Assets
Cash equivalents	$	16,108	$	-	$	-	$	16,108
Government securities		57,429		-		-		57,429
Corporate bonds		-		490		-		490
Total	$	73,537	$	490	$	-	$	74,027
Liabilities
Foreign currency forward contracts	$	-	$	112	$	-	$	112
Total	$	-	$	112	$	-	$	112

	As of December 31, 2014
	Quoted Prices in Active Markets (Level 1)		Significant Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Assets
Cash equivalents	$	68,830	$	-	$	-	$	68,830
Government securities		6,508		-		-		6,508
Corporate bonds		-		8,247		-		8,247
Total	$	75,338	$	8,247	$	-	$	83,585

Available-for-sale Securities [Table Text Block]

	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
June 30, 2015
Government securities
(Due within 1 year)	$	57,426	$	9	$	(6	)	$	57,429
Corporate bonds
(Due within 1 year)		490		-		-			490
	$	57,916	$	9	$	(6	)	$	57,919
December 31, 2014
Government securities
(Due within 1 year)	$	6,510	$	-	$	(2	)	$	6,508
Corporate bonds
(Due within 1 year)		8,251		-		(4	)		8,247
	$	14,761	$	-	$	(6	)	$	14,755