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Consolidated Statements of Operations (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Consolidated Statements Of Operations [Abstract]      
Sales $ 75,622us-gaap_SalesRevenueNet [1] $ 73,298us-gaap_SalesRevenueNet [1] $ 48,729us-gaap_SalesRevenueNet [1]
Cost of sales 44,835us-gaap_CostOfGoodsAndServicesSold 43,865us-gaap_CostOfGoodsAndServicesSold 28,849us-gaap_CostOfGoodsAndServicesSold
Gross profit 30,787us-gaap_GrossProfit 29,433us-gaap_GrossProfit 19,880us-gaap_GrossProfit
Operating expenses      
Research and development 6,480us-gaap_ResearchAndDevelopmentExpense [2] 5,465us-gaap_ResearchAndDevelopmentExpense [2] 4,401us-gaap_ResearchAndDevelopmentExpense [2]
Sales and marketing 4,418us-gaap_SellingAndMarketingExpense 3,818us-gaap_SellingAndMarketingExpense 3,081us-gaap_SellingAndMarketingExpense
General and administrative 2,843us-gaap_GeneralAndAdministrativeExpense 2,572us-gaap_GeneralAndAdministrativeExpense 2,369us-gaap_GeneralAndAdministrativeExpense
Total operating expenses 13,741us-gaap_OperatingExpenses 11,855us-gaap_OperatingExpenses 9,851us-gaap_OperatingExpenses
Operating income 17,046us-gaap_OperatingIncomeLoss 17,578us-gaap_OperatingIncomeLoss 10,029us-gaap_OperatingIncomeLoss
Financial income, net 263us-gaap_NonoperatingIncomeExpense 404us-gaap_NonoperatingIncomeExpense 752us-gaap_NonoperatingIncomeExpense
Income before income taxes 17,309us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 17,982us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 10,781us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income taxes 2,704us-gaap_IncomeTaxExpenseBenefit 905us-gaap_IncomeTaxExpenseBenefit 910us-gaap_IncomeTaxExpenseBenefit
Net income $ 14,605us-gaap_NetIncomeLoss $ 17,077us-gaap_NetIncomeLoss $ 9,871us-gaap_NetIncomeLoss
Income per share:      
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
Weighted average number of ordinary shares used to compute basic income per share (in thousands) 7,184,114us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 7,103,021us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 6,933,576us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Weighted average number of ordinary shares used to compute diluted income per share (in thousands) 7,318,906us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 7,246,032us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 6,968,305us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
[1] Including sales to related parties in the amount of US$ 558 thousand, US$ 851 thousand and US$ 1,041 thousand in 2012, 2013 and 2014, respectively.
[2] Including services from related parties in the amount of US$ 42 thousand, US$ 133 thousand and US$ 243 thousand in 2012, 2013 and 2014, respectively.