Note 12 - Accumulated Other Comprehensive Income (loss) - Reclassifications Out of Accumulated Other Comprehensive Income (loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cost of revenues	$ (2,023)	$ (1,972)
Research and development	(12,330)	(12,016)
Sales and marketing	3,021	3,176
General and administrative	(2,317)	(2,954)
Total, before income taxe	(2,132)	(1,981)
Income taxes	165	201
Net loss	(2,297)	(2,182)
Financial income, net	800	927
Reclassification out of Accumulated Other Comprehensive Income [Member]
Net loss	46	(14)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains (Losses) on Cash Flow Hedges [Member]
Cost of revenues	2	(1)
Research and development	64	(16)
Sales and marketing	2	(1)
General and administrative	5	(1)
Total, before income taxe	73	(19)
Income taxes	9	(2)
Net loss	64	(17)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains (Losses) on Available-for-sale Marketable Securities [Member]
Income taxes	(6)	1
Net loss	(18)	3
Financial income, net	$ (24)	$ 4