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Cash and Cash Equivalents (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Cash and Cash Equivalents [Abstract]        
Cash $ 14,172us-gaap_Cash $ 10,593us-gaap_Cash    
Cash equivalents 3,718us-gaap_CashEquivalentsAtCarryingValue [1] 2,404us-gaap_CashEquivalentsAtCarryingValue [1]    
Cash and cash equivalents $ 17,890us-gaap_CashAndCashEquivalentsAtCarryingValue $ 12,997us-gaap_CashAndCashEquivalentsAtCarryingValue $ 13,306us-gaap_CashAndCashEquivalentsAtCarryingValue $ 11,483us-gaap_CashAndCashEquivalentsAtCarryingValue
Weighted average interest rate of cash on deposit 0.14%silc_WeightedAverageInterestRateOfCashOnDeposit 0.74%silc_WeightedAverageInterestRateOfCashOnDeposit    
[1] Comprised mainly of deposits in banks as at December 31, 2013 and 2014 carrying a weighted average interest rate of 0.74% and 0.14%, respectively.