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Summary of Significant Accounting Policies (Computation of Basic and Diluted Income Per Ordinary Share) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Summary of Significant Accounting Policies [Abstract]      
Net income attributable to ordinary shares (US$ thousands) $ 14,605us-gaap_NetIncomeLoss $ 17,077us-gaap_NetIncomeLoss $ 9,871us-gaap_NetIncomeLoss
Weighted average number of ordinary shares outstanding used in basic income per ordinary share calculation 7,184,114us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 7,103,021us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 6,933,576us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Add assumed exercise of outstanding dilutive potential ordinary shares 134,792us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 143,011us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 34,729us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Weighted average number of ordinary shares outstanding used in diluted income per ordinary share calculation 7,318,906us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 7,246,032us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 6,968,305us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic income per ordinary share (US$) $ 2.033us-gaap_EarningsPerShareBasic $ 2.404us-gaap_EarningsPerShareBasic $ 1.424us-gaap_EarningsPerShareBasic
Diluted income per ordinary share (US$) $ 1.996us-gaap_EarningsPerShareDiluted $ 2.357us-gaap_EarningsPerShareDiluted $ 1.417us-gaap_EarningsPerShareDiluted
The weighted average number of shares related to options and RSUs excluded from the diluted earnings per share calculation because of anti-dilutive effect 37,304us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount    135,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount