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, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Cost of revenues	$ (2,493)	$ (1,988)	$ (4,516)	$ (3,960)
Research and development	(12,390)	(11,843)	(24,720)	(23,859)
Sales and marketing	2,956	3,399	5,977	6,575
General and administrative	(2,534)	(2,833)	(4,851)	(5,787)
Total, before income taxe	(1,287)	(1,884)	(3,419)	(3,865)
Taxes on income	225	206	390	407
Net loss	(1,512)	(2,090)	(3,809)	(4,272)
Financial income, net	896	777	1,696	1,704
Reclassification out of Accumulated Other Comprehensive Income [Member]
Net loss	93	(159)	139	(173)
Reclassification out of Accumulated Other Comprehensive Income [Member] \| Unrealized Gains (Losses) on Cash Flow Hedges [Member]
Cost of revenues	2	(3)	4	(4)
Research and development	101	(154)	165	(170)
Sales and marketing	3	(6)	5	(7)
General and administrative	8	(14)	13	(15)
Total, before income taxe	114	(177)	187	(196)
Taxes on income	13	(19)	22	(21)
Net loss	101	(158)	165	(175)
Reclassification out of Accumulated Other Comprehensive Income [Member] \| Unrealized Gains (Losses) on Available-for-sale Marketable Securities [Member]
Taxes on income	(3)	(1)	(9)
Net loss	(8)	(1)	(26)	2
Financial income, net	$ (11)	$ (2)	$ (35)	$ 2

The aggregate cost of goods produced and sold and services rendered during the reporting period.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount after accretion (amortization) of discount (premium), and investment expense, of interest income and dividend income on nonoperating securities.

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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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