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Consolidated Statements of Operations - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Statement [Abstract]      
Sales [1] $ 107,398 $ 105,240 $ 133,753
Cost of sales 73,632 69,146 91,697
Gross profit 33,766 36,094 42,056
Operating expenses      
Research and development [2] 17,244 15,075 14,820
Sales and marketing 6,209 6,647 6,642
General and administrative 4,065 4,159 3,943
Total operating expenses 27,518 25,881 25,405
Operating income 6,248 10,213 16,651
Financial income, net 1,034 1,646 923
Income before income taxes 7,282 11,859 17,574
Income taxes 1,557 1,623 2,937
Net income $ 5,725 $ 10,236 $ 14,637
Income per share:      
Basic income per ordinary share (US$) $ 0.804 $ 1.361 $ 1.938
Diluted income per ordinary share (US$) $ 0.800 $ 1.352 $ 1.912
Weighted average number of ordinary shares used to compute basic income per share (in thousands) 7,118,244 7,520,389 7,552,094
Weighted average number of ordinary shares used to compute diluted income per share (in thousands) 7,156,763 7,572,617 7,657,330
[1] Including sales to related parties in the amount of US$ 1,063 thousand, US$ 0 thousand and US$ 0 thousand in 2018, 2019 and 2020, respectively.
[2] Including services from related parties in the amount of US$ 311 thousand, US$ 0 thousand and US$ 0 thousand in 2018, 2019 and 2020, respectively.