Note 1 - General (Tables)

9 Months Ended

Sep. 30, 2017

Notes Tables

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]

	Assets as of September 30, 2017 (unaudited)				Liabilities as of December 31, 2016
	Notional Amount		Fair Value		Notional Amount		Fair Value
Foreign exchange forward contract derivatives in cash flow hedging relationships - included in other current assets and accrued expenses and other short term liabilities	$	13,531	$	1,012	$	46,116	$	(479	)

Cash, Cash Equivalents and Investments [Table Text Block]

	As of September 30, 2017 (unaudited)
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Loss			Fair Value
Cash and cash equivalents
Cash	$	46,796	$	-	$	-		$	46,796
Money market funds		6,682		-		-			6,682
Total	$	53,478	$	-	$	-		$	53,478
Short-term investments
US Treasury securities	$	39,830	$	2	$	(5	)	$	39,827
Term bank deposits		35,136		-		-			35,136
Total	$	74,966	$	2	$	(5	)	$	74,963

	As of December 31, 2016
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Loss		Fair Value
Cash and cash equivalents
Cash	$	42,175	$	-	$	-	$	42,175
Money market funds		6,140		-		-		6,140
Total	$	48,315	$	-	$	-	$	48,315
Short-term investments
Term bank deposits	$	65,493		-		-	$	65,493
Total	$	65,493	$	-	$	-	$	65,493