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Summary of Significant Accounting Policies (Computation of Basic and Diluted Income Per Ordinary Share) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accounting Policies [Abstract]      
Net income attributable to ordinary shares (US$ thousands) $ 14,637 $ 21,714 $ 13,137
Weighted average number of ordinary shares outstanding used in basic income per ordinary share calculation 7,552,094 7,455,528 7,343,696
Add assumed exercise of outstanding dilutive potential ordinary shares 105,236 146,443 91,485
Weighted average number of ordinary shares outstanding used in diluted income per ordinary share calculation 7,657,330 7,601,971 7,435,181
Basic income per ordinary share (US$) $ 1.938 $ 2.912 $ 1.789
Diluted income per ordinary share (US$) $ 1.912 $ 2.856 $ 1.767
The weighted average number of shares related to options and RSUs excluded from the diluted earnings per share calculation because of anti-dilutive effect 171,086 9,633