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Document And Entity Information
 12 Months Ended
Dec. 31, 2018
shares
Document And Entity Information [Abstract]  
Entity Registrant Name SILICOM LTD.
Entity Central Index Key 0000916793
Document Type 20-F
Amendment Flag false
Document Period End Date Dec. 31, 2018
Document Fiscal Period Focus FY
Document Fiscal Year Focus 2018
Current Fiscal Year End Date --12-31
Entity Filer Category Accelerated Filer
Entity Shell Company false
Entity Emerging Growth Company false
Entity Common Stock, Shares Outstanding 7,559,205
Entity Well-known Seasoned Issuer No
Entity Current Reporting Status Yes
Entity Voluntary Filers No