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Consolidated Statements of Operations - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Statement [Abstract]      
Sales [1] $ 105,240 $ 133,753 $ 125,690
Cost of sales 69,146 91,697 79,762
Gross profit 36,094 42,056 45,928
Operating expenses      
Research and development [2] 15,075 14,820 13,915
Sales and marketing 6,647 6,642 6,722
General and administrative 4,159 3,943 4,507
Contingent consideration (4,642)
Total operating expenses 25,881 25,405 20,502
Operating income 10,213 16,651 25,426
Financial income, net 1,646 923 156
Income before income taxes 11,859 17,574 25,582
Income taxes 1,623 2,937 3,868
Net income $ 10,236 $ 14,637 $ 21,714
Income per share:      
Basic income per ordinary share (US$) $ 1.361 $ 1.938 $ 2.912
Diluted income per ordinary share (US$) $ 1.352 $ 1.912 $ 2.856
Weighted average number of ordinary shares used to compute basic income per share (in thousands) 7,520,389 7,552,094 7,455,528
Weighted average number of ordinary shares used to compute diluted income per share (in thousands) 7,572,617 7,657,330 7,601,971
[1] Including sales to related parties in the amount of US$ 1,275 thousand, US$ 1,063 thousand and US$ 0 in 2017, 2018 and 2019, respectively.
[2] Including services from related parties in the amount of US$ 170 thousand, US$ 311 thousand and US$ 0 in 2017, 2018 and 2019, respectively.