Note 10 - Accumulated Other Comprehensive Income (loss) - Reclassifications Out of Accumulated Other Comprehensive Income (loss) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cost of revenues	$ (7,951)	$ (6,953)	$ (6,086)
Research and development	(47,755)	(40,385)	(30,838)
Sales and marketing	12,161	12,572	11,540
General and administrative	10,354	10,488	8,567
Income (loss) before taxes on income	1,303	18,899	16,425
Income taxes (Note 13)	729	1,871	3,325
Net income	574	17,028	13,100
Financial income, net (Note 12)	3,418	3,026	2,039
Reclassification out of Accumulated Other Comprehensive Income [Member]
Net income	(373)	169	135
Reclassification out of Accumulated Other Comprehensive Income [Member] \| Unrealized Gains (Losses) on Cash Flow Hedges [Member]
Cost of revenues	(7)	4	4
Research and development	(308)	162	132
Sales and marketing	(13)	10	12
General and administrative	(26)	13	13
Income (loss) before taxes on income	(354)	189	161
Income taxes (Note 13)	(42)	21	18
Net income	(312)	168	143
Reclassification out of Accumulated Other Comprehensive Income [Member] \| Unrealized Gains (Losses) on Available-for-sale Marketable Securities [Member]
Income taxes (Note 13)	(6)	(1)	(1)
Net income	(61)	1	(8)
Financial income, net (Note 12)	$ (67)		$ (9)

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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