Note 12 - Accumulated Other Comprehensive Income (Loss) - Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Cost of revenues	$ (3,005)	$ (2,493)	$ (5,756)	$ (4,516)
Research and development	(14,979)	(12,390)	(30,092)	(24,720)
Sales and marketing	2,893	2,956	6,061	5,977
General and administrative	(3,663)	(2,534)	(7,327)	(4,851)
Total, before income taxe	(671)	(1,287)	(1,503)	(3,419)
Taxes on income	419	225	772	390
Net loss	(1,090)	(1,512)	(2,275)	(3,809)
Financial income, net	838	896	1,669	1,696
Reclassification out of Accumulated Other Comprehensive Income [Member]
Net loss	133	93	132	139
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains (Losses) on Cash Flow Hedges [Member]
Cost of revenues	3	2	3	4
Research and development	142	101	142	165
Sales and marketing	5	3	5	5
General and administrative	12	8	12	13
Total, before income taxe	162	114	162	187
Taxes on income	19	13	19	22
Net loss	143	101	143	165
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains (Losses) on Available-for-sale Marketable Securities [Member]
Taxes on income	(3)	(3)	(4)	(9)
Net loss	(10)	(8)	(11)	(26)
Financial income, net	$ (13)	$ (11)	$ (15)	$ (35)