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Condensed Interim Consolidated Statements of Operations (unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Income Statement [Abstract]        
Sales $ 30,266 $ 26,001 $ 55,608 $ 47,358
Cost of sales 19,142 16,150 34,899 29,575
Gross profit 11,124 9,851 20,709 17,783
Operating expenses        
Research and development 3,328 2,869 6,842 5,897
Sales and marketing 1,593 1,648 3,235 3,175
General and administrative 1,049 986 2,180 2,001
Contingent consideration expense (benefit) 60 62 118 15
Total operating expenses 6,030 5,565 12,375 11,088
Operating income 5,094 4,286 8,334 6,695
Financial income, net 13 90 43 25
Income before income taxes 5,107 4,376 8,377 6,720
Income taxes 914 843 1,587 1,279
Net income $ 4,193 $ 3,533 $ 6,790 $ 5,441
Income per share:        
Basic income per ordinary share (US$) $ 0.565 $ 0.482 $ 0.917 $ 0.744
Weighted average number of ordinary shares used to compute basic income per share (in thousands) 7,420 7,335 7,401 7,316
Diluted income per ordinary share (US$) $ 0.554 $ 0.477 $ 0.901 $ 0.735
Weighted average number of ordinary shares used to compute diluted income per share (in thousands) 7,573 7,414 7,536 7,404