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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Accounting Policies [Abstract]      
Net income attributable to ordinary shares (US$ thousands) $ 21,714 $ 13,137 $ 16,520
Weighted average number of ordinary shares outstanding used in basic income per ordinary share calculation 7,455,528 7,343,696 7,268,536
Add assumed exercise of outstanding dilutive potential ordinary shares 146,443 91,485 99,448
Weighted average number of ordinary shares outstanding used in diluted income per ordinary share calculation 7,601,971 7,435,181 7,367,984
Basic income per ordinary share (US$) $ 2.912 $ 1.789 $ 2.273
Diluted income per ordinary share (US$) $ 2.856 $ 1.767 $ 2.242
The weighted average number of shares related to options and RSUs excluded from the diluted earnings per share calculation because of anti-dilutive effect 9,633 43,181