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Consolidated Statements of Operations - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Statement [Abstract]      
Sales [1] $ 133,753 $ 125,690 $ 100,347
Cost of sales 91,697 79,762 61,796
Gross profit 42,056 45,928 38,551
Operating expenses      
Research and development [2] 14,820 13,915 12,663
Sales and marketing 6,642 6,722 6,423
General and administrative 3,943 4,507 3,969
Contingent consideration benefit (4,642) (334)
Total operating expenses 25,405 20,502 22,721
Operating income 16,651 25,426 15,830
Financial income, net 923 156 35
Income before income taxes 17,574 25,582 15,865
Income taxes 2,937 3,868 2,728
Net income $ 14,637 $ 21,714 $ 13,137
Income per share:      
Basic income per ordinary share (US$) $ 1.938 $ 2.912 $ 1.789
Diluted income per ordinary share (US$) $ 1.912 $ 2.856 $ 1.767
Weighted average number of ordinary shares used to compute basic income per share (in thousands) 7,552,094 7,455,528 7,343,696
Weighted average number of ordinary shares used to compute diluted income per share (in thousands) 7,657,330 7,601,971 7,435,181
[1] Including sales to related parties in the amount of US$ 762 thousand, US$ 1,275 thousand and US$ 1,063 thousand in 2016, 2017 and 2018, respectively.
[2] Including services from related parties in the amount of US$ 351 thousand, US$ 170 thousand and US$ 311 thousand in 2016, 2017 and 2018, respectively.