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Consolidated Statements of Operations - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Statement [Abstract]      
Sales [1] $ 125,690 $ 100,347 $ 82,738
Cost of sales 79,762 61,796 48,659
Gross profit 45,928 38,551 34,079
Operating expenses      
Research and development [2] 13,915 12,663 9,702
Sales and marketing 6,722 6,423 5,651
General and administrative 4,507 3,969 3,611
Contingent consideration benefit (4,642) (334) (3,090)
Total operating expenses 20,502 22,721 15,874
Operating income 25,426 15,830 18,205
Financial income, net 156 35 220
Income before income taxes 25,582 15,865 18,425
Income taxes 3,868 2,728 1,905
Net income $ 21,714 $ 13,137 $ 16,520
Income per share:      
Basic income per ordinary share (US$) $ 2.912 $ 1.789 $ 2.273
Diluted income per ordinary share (US$) $ 2.856 $ 1.767 $ 2.242
Weighted average number of ordinary shares used to compute basic income per share (in thousands) 7,455,528 7,343,696 7,268,536
Weighted average number of ordinary shares used to compute diluted income per share (in thousands) 7,601,971 7,435,181 7,367,984
[1] Including sales to related parties in the amount of US$ 1,154 thousand, US$ 762 thousand and US$ 1,275 thousand in 2015, 2016 and 2017, respectively.
[2] Including services from related parties in the amount of US$ 285 thousand, US$ 351 thousand and US$ 170 thousand in 2015, 2016 and 2017, respectively.