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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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Income Statement [Abstract]        
Sales $ 25,402 $ 27,603 $ 55,629 $ 57,125
Cost of sales 16,728 18,714 36,775 43,686
Gross profit 8,674 8,889 18,854 13,439
Operating expenses        
Research and development 3,659 3,647 7,479 7,078
Sales and marketing 1,692 1,596 3,321 3,132
General and administrative 1,054 1,068 2,077 1,975
Total operating expenses 6,405 6,311 12,877 12,185
Operating income 2,269 2,578 5,977 1,254
Financial income, net 430 200 725 484
Income before income taxes 2,699 2,778 6,702 1,738
Income taxes 421 342 784 741
Net income $ 2,278 $ 2,436 $ 5,918 $ 997
Income per share:        
Basic income per ordinary share (US$) $ 0.300 $ 0.323 $ 0.780 $ 0.132
Weighted average number of ordinary shares used to compute basic income per share (in thousands) 7,587 7,550 7,587 7,550
Diluted income per ordinary share (US$) $ 0.298 $ 0.319 $ 0.774 $ 0.130
Weighted average number of ordinary shares used to compute diluted income per share (in thousands) 7,635 7,629 7,644 7,671