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Commitments and Contingencies (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Loss Contingencies [Line Items]      
Percent of royalties paid must equal the dollar linked amount of the grants received 100.00%silc_PercentOfRoyaltiesPaidMustEqualDollarLinkedAmountOfGrantsReceived    
Total commitment in respect of royalty-bearing participations $ 2,960us-gaap_RoyaltyGuaranteesCommitmentsAmount $ 2,960us-gaap_RoyaltyGuaranteesCommitmentsAmount  
Rental expenses under the lease agreements 1,243us-gaap_LeaseAndRentalExpense 837us-gaap_LeaseAndRentalExpense 676us-gaap_LeaseAndRentalExpense
Line of credit $ 154us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity    
Minimum [Member]      
Loss Contingencies [Line Items]      
Royalty rates 2.00%silc_RoyaltyRates
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Maximum [Member]      
Loss Contingencies [Line Items]      
Royalty rates 5.00%silc_RoyaltyRates
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Silicom Research and Development [Member] | Minimum [Member]      
Loss Contingencies [Line Items]      
Royalty rates 2.00%silc_RoyaltyRates
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ silc_ResearchAndDevelopmentAxis
= silc_SilicomResearchAndDevelopmentMember
   
Silicom Research and Development [Member] | Maximum [Member]      
Loss Contingencies [Line Items]      
Royalty rates 3.50%silc_RoyaltyRates
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ silc_ResearchAndDevelopmentAxis
= silc_SilicomResearchAndDevelopmentMember
   
July 1, 1997 - January 31, 2000 Project [Member]      
Loss Contingencies [Line Items]      
Royalty rates 4.00%silc_RoyaltyRates
/ silc_ResearchAndDevelopmentAxis
= silc_July11997January312000ProjectMember