Note 2 - Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2017

Notes Tables

Schedule of Useful Life of Property and Equipment [Table Text Block]

	%			Mainly %
Computers and equipment	20	-	33		33
Office furniture and equipment	7	-	15		15
Leasehold improvements	see below

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

		Fair value of derivative instruments
Derivative assets		December 31,
(liabilities) designated as hedging	Balance sheet location	2017		2016
Foreign exchange forward contracts and put and call options	Other accounts receivable and prepaid expenses (Accrued expenses and other accounts payable)	$	-	$	9
	Total	$	-	$	9

Schedule of Derivative Instruments, Effect on Other Comprehensive Income (Loss) [Table Text Block]

	Gains (losses) on derivatives recognized in OCI
	Year ended December 31,
	2017		2016		2015
Foreign exchange forward contracts and put and call options	$	163	$	45	$	(38	)

Derivative Instruments, Gain (Loss) [Table Text Block]

		Gains (losses) on derivatives reclassified from OCI to income
		Year ended December 31,
	Location	2017		2016		2015
Foreign exchange forward contracts and put and call options	Operating expenses	$	172	$	1	$	(621	)

Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]

	Unrealized gains (losses) on available- for-sale marketable securities			Unrealized gains (losses) on Cash Flow Hedges			Unrealized gains (losses) on components of defined benefit plans			Unrealized gains (losses) on foreign currency translation			Total
January 1, 2017	$	(1,101	)	$	9		$	(455	)	$	(305	)	$	(1,852	)
Other comprehensive income (loss) before reclassifications		(158	)		163			24			49			78
Losses (gains) reclassified from accumulated other comprehensive income (loss)		50			(172	)		22			-			(100	)
Net current period other comprehensive income (loss)		(108	)		(9	)		46			49			(22	)
December 31, 2017	$	(1,209	)	$	-		$	(409	)	$	(256	)	$	(1,874	)

Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]

Details about Accumulated Other Comprehensive Income (Loss) Components	Amount Reclassified from Accumulated Other Comprehensive Income (Loss)			Affected Line Item in the Statement of Income (Loss)
Losses on available-for-sale marketable securities	$	50		Financial income, net
		-		Provision for income taxes
		50		Total, net of income taxes
Gains on cash flow hedges
		(135	)	Research and development
		(13	)	Sales and marketing
		(24	)	General and administrative
		(172	)	Total, before income taxes
		-		Provision for income taxes
		(172	)	Total, net of income taxes
Losses on components of defined benefit plans		14		Research and development
		8		Sales and marketing
		22		Total, before income taxes
		-		Provision for income taxes
		22		Total, net of income taxes
Total reclassificati ons for the period		(100	)	Total, net of income taxes