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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, 2016
Dec. 31, 2015
Dec. 31, 2014
Accounting Policies [Abstract]      
Net income attributable to ordinary shares (US$ thousands) $ 13,137 $ 16,520 $ 14,605
Weighted average number of ordinary shares outstanding used in basic income per ordinary share calculation 7,343,696 7,268,536 7,184,114
Add assumed exercise of outstanding dilutive potential ordinary shares 91,485 99,448 134,792
Weighted average number of ordinary shares outstanding used in diluted income per ordinary share calculation 7,435,181 7,367,984 7,318,906
Basic income per ordinary share (US$) $ 1.789 $ 2.273 $ 2.033
Diluted income per ordinary share (US$) $ 1.767 $ 2.242 $ 1.996
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 37,304