Note 11 - Accumulated Other Comprehensive Income (Loss) - Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cost of revenues		$ (10,749)	$ (10,106)	$ (7,951)
Research and development	[1]	(62,010)	(52,843)	(47,755)
Sales and marketing *)	[1]	11,907	12,363	12,161
General and administrative	[1]	(14,116)	(11,841)	(10,354)
Total, before income taxe		2,521	1,367	1,303
Taxes on income		4,900	1,339	729
Net income (loss)		(2,379)	28	574
Financial income, net		3,284	3,291	3,418
Reclassification out of Accumulated Other Comprehensive Income [Member]
Net income (loss)		600	252	(373)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains (Losses) on Cash Flow Hedges [Member]
Cost of revenues		14	5	(7)
Research and development		607	272	(308)
Sales and marketing *)		19	8	(13)
General and administrative		48	22	(26)
Total, before income taxe		688	307	(354)
Taxes on income		83	36	(42)
Net income (loss)		605	271	(312)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains (Losses) on Available-for-sale Marketable Securities [Member]
Taxes on income		(1)	(9)	(6)
Net income (loss)		(5)	(19)	(61)
Financial income, net		$ (6)	$ (28)	$ (67)

[1] Not including amortization of technology shown separately.