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Consolidated Statements of Operations - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Statement [Abstract]      
Sales $ 128,460 $ 107,398 $ 105,240
Cost of sales 84,072 73,632 69,146
Gross profit 44,388 33,766 36,094
Operating expenses      
Research and development 20,091 17,244 15,075
Sales and marketing 6,599 6,209 6,647
General and administrative 4,641 4,065 4,159
Total operating expenses 31,331 27,518 25,881
Operating income 13,057 6,248 10,213
Financial income, net (152) 1,034 1,646
Income before income taxes 12,905 7,282 11,859
Income taxes 2,364 1,557 1,623
Net income $ 10,541 $ 5,725 $ 10,236
Income per share:      
Basic income per ordinary share (US$) $ 1.544 $ 0.804 $ 1.361
Diluted income per ordinary share (US$) $ 1.513 $ 0.800 $ 1.352
Weighted average number of ordinary shares used to compute basic income per share (in thousands) 6,825,630 7,118,244 7,520,389
Weighted average number of ordinary shares used to compute diluted income per share (in thousands) 6,968,802 7,156,763 7,572,617