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Marketable Securities (Held-To-Maturity Securities) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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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).

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