Note 3 - Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2015

Notes Tables

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

	As of December 31, 2015
	Quoted Prices  in Active Markets (Level 1)		Significant Observable Inputs (Level 2)		Significant Unobservable Inputs (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

	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
December 31, 2015
Government securities
(Due within 1 year)	$	25,243	$	1	$	(12	)	$	25,232
	$	25,243	$	1	$	(12	)	$	25,232
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