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Marketable Securities (Held-To-Maturity Securities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Schedule of Held-to-maturity Securities [Line Items]    
Amortized cost basis $ 35,864us-gaap_HeldToMaturitySecurities [1] $ 39,632us-gaap_HeldToMaturitySecurities [1]
Gross unrealized holding gains    89silc_HeldtomaturitySecuritiesGrossUnrecognizedHoldingGain
Gross unrealized holding (losses) (340)silc_HeldToMaturitySecuritiesGrossUnrecognizedHoldingLoss (243)silc_HeldToMaturitySecuritiesGrossUnrecognizedHoldingLoss
Aggregate fair value 35,524us-gaap_HeldToMaturitySecuritiesFairValue [2] 39,478us-gaap_HeldToMaturitySecuritiesFairValue [2]
Accrued interest on securities 339silc_AccruedInterestOnSecurities 391silc_AccruedInterestOnSecurities
Current [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized cost basis 15,328us-gaap_HeldToMaturitySecurities
/ us-gaap_DebtSecurityAxis
= silc_CurrentMember		 [1] 15,015us-gaap_HeldToMaturitySecurities
/ us-gaap_DebtSecurityAxis
= silc_CurrentMember		 [1]
Gross unrealized holding gains    20silc_HeldtomaturitySecuritiesGrossUnrecognizedHoldingGain
/ us-gaap_DebtSecurityAxis
= silc_CurrentMember
Gross unrealized holding (losses) (69)silc_HeldToMaturitySecuritiesGrossUnrecognizedHoldingLoss
/ us-gaap_DebtSecurityAxis
= silc_CurrentMember		 (76)silc_HeldToMaturitySecuritiesGrossUnrecognizedHoldingLoss
/ us-gaap_DebtSecurityAxis
= silc_CurrentMember
Aggregate fair value 15,259us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_DebtSecurityAxis
= silc_CurrentMember		 [2] 14,959us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_DebtSecurityAxis
= silc_CurrentMember		 [2]
Non Current [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized cost basis 20,536us-gaap_HeldToMaturitySecurities
/ us-gaap_DebtSecurityAxis
= silc_NonCurrentMember		 [1] 24,617us-gaap_HeldToMaturitySecurities
/ us-gaap_DebtSecurityAxis
= silc_NonCurrentMember		 [1]
Gross unrealized holding gains    69silc_HeldtomaturitySecuritiesGrossUnrecognizedHoldingGain
/ us-gaap_DebtSecurityAxis
= silc_NonCurrentMember
Gross unrealized holding (losses) (271)silc_HeldToMaturitySecuritiesGrossUnrecognizedHoldingLoss
/ us-gaap_DebtSecurityAxis
= silc_NonCurrentMember		 (167)silc_HeldToMaturitySecuritiesGrossUnrecognizedHoldingLoss
/ us-gaap_DebtSecurityAxis
= silc_NonCurrentMember
Aggregate fair value $ 20,265us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_DebtSecurityAxis
= silc_NonCurrentMember		 [2] $ 24,519us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_DebtSecurityAxis
= silc_NonCurrentMember		 [2]
[1] Including accrued interest in the amount of US$ 391 thousand and US$ 339 thousand as of December 31, 2013 and 2014 respectively.
[2] Fair value is being determined using quoted market prices in active markets (Level 1).