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Taxes on Income (Narrative) (Details)
In Thousands, unless otherwise specified
 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2014
USD ($)
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2014
Beneficial Enterprise [Member]
USD ($)
Dec. 31, 2013
Beneficial Enterprise [Member]
USD ($)
Aug. 31, 2013
Israel Tax Reform [Member]
Dec. 31, 2014
Manufacturing Plant [Member]
Dec. 31, 2014
Research and Development Center [Member]
Dec. 31, 2014
Development Area A [Member]
Preferred Enterprise [Member]
Dec. 31, 2014
Rest of Country [Member]
Preferred Enterprise [Member]
Dec. 31, 2014
Minimum [Member]
Beneficial Enterprise [Member]
ILS
Dec. 31, 2014
Minimum [Member]
Expansion [Member]
ILS
Dec. 31, 2014
Minimum [Member]
Specific Foreign Market [Member]
Beneficial Enterprise [Member]
Dec. 31, 2014
Maximum [Member]
Beneficial Enterprise [Member]
Dec. 31, 2014
Maximum [Member]
Expansion [Member]
Dec. 31, 2014
Maximum [Member]
Specific Foreign Market [Member]
Beneficial Enterprise [Member]
Income Tax Disclosure [Line Items]                                
Tax rate 26.50%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 25.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 25.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate                          
Number of years of tax exemption             10 years 2 years                
Tax rate increase           1.50%silc_EffectiveIncomeTaxRateIncrease
/ us-gaap_StatementScenarioAxis
= silc_IsraelTaxReformMember		                    
Maximum percent of taxable income for the plan               25.00%silc_MaximumPercentOfTaxableIncomeForPlan
/ us-gaap_StatementGeographicalAxis
= silc_ResearchAndDevelopmentCenterMember		                
Tax exemption       $ 44,892silc_TaxExemptionAmount
/ us-gaap_StatementScenarioAxis
= silc_BeneficialEnterpriseMember		 $ 50,683silc_TaxExemptionAmount
/ us-gaap_StatementScenarioAxis
= silc_BeneficialEnterpriseMember		                      
Assumed income tax liability       11,223silc_AssumedDeferredTaxLiabilityNotRecognizedRelatedToTaxExemptRetainedEarningsDueToApprovedEnterpriseAndBenefitedEnterpriseStatus
/ us-gaap_StatementScenarioAxis
= silc_BeneficialEnterpriseMember		 12,671silc_AssumedDeferredTaxLiabilityNotRecognizedRelatedToTaxExemptRetainedEarningsDueToApprovedEnterpriseAndBenefitedEnterpriseStatus
/ us-gaap_StatementScenarioAxis
= silc_BeneficialEnterpriseMember		                      
Number of years of benefited tax rate under the alternative benefits method for the research and development center               8 years                
Corporate tax on cash dividends distributed from exempted profits   25.00%silc_CorporateTaxOnCashDividendsDistributedFromExemptedProfits                            
Withholding tax deduction from cash dividends distributed from benefited profits 20.00%silc_WithholdingTaxDeductionFromCashDividendsDistributedFromBenefitedProfits 15.00%silc_WithholdingTaxDeductionFromCashDividendsDistributedFromBenefitedProfits                            
Percentage of revenue from one country to receive tax benefits                         25.00%silc_PercentageOfRevenueFromOneCountryToReceiveTaxBenefits
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementGeographicalAxis
= silc_SpecificForeignMarketMember
/ us-gaap_StatementScenarioAxis
= silc_BeneficialEnterpriseMember		     75.00%silc_PercentageOfRevenueFromOneCountryToReceiveTaxBenefits
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementGeographicalAxis
= silc_SpecificForeignMarketMember
/ us-gaap_StatementScenarioAxis
= silc_BeneficialEnterpriseMember
Market size criteria to receive tax benefits, number of residents (people)                         14,000,000silc_MarketSizeCriteriaToReceiveTaxBenefitsNumberOfResidents
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementGeographicalAxis
= silc_SpecificForeignMarketMember
/ us-gaap_StatementScenarioAxis
= silc_BeneficialEnterpriseMember		      
Required investment in production machinery and equipment to receive tax benefits                     300silc_RequiredInvestmentInProductionMachineryAndEquipmentToReceiveTaxBenefits
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementScenarioAxis
= silc_BeneficialEnterpriseMember		 300silc_RequiredInvestmentInProductionMachineryAndEquipmentToReceiveTaxBenefits
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementScenarioAxis
= silc_ExpansionMember		        
Time allowed to meet investment in production machinery and equipment to receive tax benefits                           3 years 3 years  
Tax rate 2014 and thereafter           26.50%silc_CorporateStatutoryTaxRateNextTwelveMonthsAndThereafter
/ us-gaap_StatementScenarioAxis
= silc_IsraelTaxReformMember		     9.00%silc_CorporateStatutoryTaxRateNextTwelveMonthsAndThereafter
/ us-gaap_StatementGeographicalAxis
= silc_DevelopmentAreaMember
/ us-gaap_StatementScenarioAxis
= silc_PreferredEnterpriseMember		 16.00%silc_CorporateStatutoryTaxRateNextTwelveMonthsAndThereafter
/ us-gaap_StatementGeographicalAxis
= silc_RestOfCountryMember
/ us-gaap_StatementScenarioAxis
= silc_PreferredEnterpriseMember		            
Non-Israeli subsidiaries' undistributed earnings for which Company has not provided for Israeli income and foreign withholding taxes 1,850us-gaap_UndistributedEarningsOfForeignSubsidiaries                              
Assumed deferred tax liability attributable to taxable temporary differences from non-Israeli subsidiaries'' undistributed earnings $ 218silc_AssumedDeferredTaxLiabilitiesUndistributedForeignEarnings