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Document And Entity Information
 12 Months Ended
Dec. 31, 2017
shares
Document And Entity Information [Abstract]  
Document Type 20-F
Amendment Flag false
Document Period End Date Dec. 31, 2017
Document Fiscal Period Focus FY
Document Fiscal Year Focus 2017
Entity Registrant Name SILICOM LTD.
Entity Central Index Key 0000916793
Current Fiscal Year End Date --12-31
Entity Filer Category Accelerated Filer
Entity Common Stock, Shares Outstanding 7,549,531
Entity Well-known Seasoned Issuer No
Entity Current Reporting Status Yes
Entity Voluntary Filers No