<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.20.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>159</ContextCount>
  <ElementCount>424</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>49</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>7</UnitCount>
  <MyReports>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>00000001 - Document - Document And Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/silc-daei</Role>
      <ShortName>Document And Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>00000002 - Statement - Consolidated Balance Sheets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/silc-cbs</Role>
      <ShortName>Consolidated Balance Sheets</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>00000003 - Statement - Consolidated Balance Sheets (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/silc-cbsp</Role>
      <ShortName>Consolidated Balance Sheets (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>00000004 - Statement - Consolidated Statements of Operations</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/silc-csoo</Role>
      <ShortName>Consolidated Statements of Operations</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>00000005 - Statement - Consolidated Statements of Operations (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/silc-csoop</Role>
      <ShortName>Consolidated Statements of Operations (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>00000006 - Statement - Consolidated Statements of Changes In Shareholders' Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/silc-csocise</Role>
      <ShortName>Consolidated Statements of Changes In Shareholders' Equity</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>00000007 - Statement - Consolidated Statements of Changes In Shareholders' Equity (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/silc-csocisep</Role>
      <ShortName>Consolidated Statements of Changes In Shareholders' Equity (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>00000008 - Statement - Consolidated Statements of Cash Flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/silc-csocf</Role>
      <ShortName>Consolidated Statements of Cash Flows</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>00000009 - Disclosure - General</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/silc-g</Role>
      <ShortName>General</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>00000010 - Disclosure - Summary of Significant Accounting Policies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/silc-sosap</Role>
      <ShortName>Summary of Significant Accounting Policies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>00000011 - Disclosure - Acquisitions</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/Acquisitions</Role>
      <ShortName>Acquisitions</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>00000012 - Disclosure - Cash and Cash Equivalents</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/silc-cace</Role>
      <ShortName>Cash and Cash Equivalents</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>00000013 - Disclosure - Marketable Securities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/silc-ms</Role>
      <ShortName>Marketable Securities</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>00000014 - Disclosure - Other Receivables</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/OtherReceivables</Role>
      <ShortName>Other Receivables</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>00000015 - Disclosure - Inventories</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/silc-i</Role>
      <ShortName>Inventories</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>00000016 - Disclosure - Property, Plant and Equipment, Net</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/silc-ppaen</Role>
      <ShortName>Property, Plant and Equipment, Net</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>00000017 - Disclosure - Intangible Assets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/silc-gaoia</Role>
      <ShortName>Intangible Assets</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>00000018 - Disclosure - Leases</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/Leases</Role>
      <ShortName>Leases</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>00000019 - Disclosure - Assets Held and Liability for Employees' Severance Benefits</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/silc-ahalfesb</Role>
      <ShortName>Assets Held and Liability for Employees' Severance Benefits</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>00000021 - Disclosure - Shareholders' Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/silc-se</Role>
      <ShortName>Shareholders' Equity</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>00000022 - Disclosure - Geographic areas and major customers</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/GeographicAreasAndMajorCustomers</Role>
      <ShortName>Geographic areas and major customers</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>00000023 - Disclosure - Financial Income (Expenses), Net</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/silc-fien</Role>
      <ShortName>Financial Income (Expenses), Net</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>00000024 - Disclosure - Taxes on Income</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/silc-toi</Role>
      <ShortName>Taxes on Income</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>00000025 - Disclosure - Subsequent Events</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/silc-se1</Role>
      <ShortName>Subsequent Events</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>00000026 - Disclosure - Summary of Significant Accounting Policies (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/silc-sosapp</Role>
      <ShortName>Summary of Significant Accounting Policies (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <ParentRole>http://silicom-usa.com/role/silc-sosap</ParentRole>
      <Position>25</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>00000027 - Disclosure - Summary of Significant Accounting Policies (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/silc-sosapt</Role>
      <ShortName>Summary of Significant Accounting Policies (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://silicom-usa.com/role/silc-sosap</ParentRole>
      <Position>26</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>00000028 - Disclosure - Cash and Cash Equivalents (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/silc-cacet</Role>
      <ShortName>Cash and Cash Equivalents (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://silicom-usa.com/role/silc-cace</ParentRole>
      <Position>27</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>00000029 - Disclosure - Marketable Securities (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/silc-mst</Role>
      <ShortName>Marketable Securities (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://silicom-usa.com/role/silc-ms</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>00000030 - Disclosure - Other Receivables (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/OtherReceivablesTables</Role>
      <ShortName>Other Receivables (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://silicom-usa.com/role/OtherReceivables</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>00000031 - Disclosure - Inventories (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/silc-it</Role>
      <ShortName>Inventories (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://silicom-usa.com/role/silc-i</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>00000032 - Disclosure - Property, Plant and Equipment, Net (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/silc-ppaent</Role>
      <ShortName>Property, Plant and Equipment, Net (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://silicom-usa.com/role/silc-ppaen</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>00000033 - Disclosure - Intangible Assets (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/silc-gaoiat</Role>
      <ShortName>Intangible Assets (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://silicom-usa.com/role/silc-gaoia</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>00000034 - Disclosure - Leases (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/LeasesTables</Role>
      <ShortName>Leases (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://silicom-usa.com/role/Leases</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>00000036 - Disclosure - Shareholders' Equity (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/silc-set</Role>
      <ShortName>Shareholders' Equity (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://silicom-usa.com/role/silc-se</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>00000037 - Disclosure - Geographic areas and major customers (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/silc-st</Role>
      <ShortName>Geographic areas and major customers (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://silicom-usa.com/role/GeographicAreasAndMajorCustomers</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>00000038 - Disclosure - Financial Income (Expenses), Net (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/silc-fient</Role>
      <ShortName>Financial Income (Expenses), Net (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://silicom-usa.com/role/silc-fien</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>00000039 - Disclosure - Taxes on Income (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/silc-toit</Role>
      <ShortName>Taxes on Income (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://silicom-usa.com/role/silc-toi</ParentRole>
      <Position>37</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>00000040 - Disclosure - Summary of Significant Accounting Policies (Narrative) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/SummaryOfSignificantAccountingPoliciesNarrativeDetails</Role>
      <ShortName>Summary of Significant Accounting Policies (Narrative) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://silicom-usa.com/role/silc-sosapt</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>00000041 - Disclosure - Summary of Significant Accounting Policies (Depreciation of Property, Plant and Equipment) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/silc-sosapdoppaed</Role>
      <ShortName>Summary of Significant Accounting Policies (Depreciation of Property, Plant and Equipment) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://silicom-usa.com/role/silc-sosapt</ParentRole>
      <Position>39</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>00000042 - Disclosure - Summary of Significant Accounting Policies (Schedule of consolidated balance sheet) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/SummaryOfSignificantAccountingPoliciesScheduleOfConsolidatedBalanceSheetDetails</Role>
      <ShortName>Summary of Significant Accounting Policies (Schedule of consolidated balance sheet) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://silicom-usa.com/role/silc-sosapt</ParentRole>
      <Position>40</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>00000043 - Disclosure - Summary of Significant Accounting Policies (Computation of Basic and Diluted Income Per Ordinary Share) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/silc-sosapcobadiposd</Role>
      <ShortName>Summary of Significant Accounting Policies (Computation of Basic and Diluted Income Per Ordinary Share) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://silicom-usa.com/role/silc-sosapt</ParentRole>
      <Position>41</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>00000044 - Disclosure - Acquisitions (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/AcquisitionsDetails</Role>
      <ShortName>Acquisitions (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://silicom-usa.com/role/Acquisitions</ParentRole>
      <Position>42</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>00000045 - Disclosure - Cash and Cash Equivalents (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/silc-caced</Role>
      <ShortName>Cash and Cash Equivalents (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://silicom-usa.com/role/silc-cacet</ParentRole>
      <Position>43</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>00000046 - Disclosure - Marketable Securities (Held-To-Maturity Securities) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/silc-mshsd</Role>
      <ShortName>Marketable Securities (Held-To-Maturity Securities) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://silicom-usa.com/role/silc-mst</ParentRole>
      <Position>44</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>00000047 - Disclosure - Marketable Securities (Schedule of Reconciliation of Marketable Securities) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/silc-mssoromsd</Role>
      <ShortName>Marketable Securities (Schedule of Reconciliation of Marketable Securities) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://silicom-usa.com/role/silc-mst</ParentRole>
      <Position>45</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>00000048 - Disclosure - Marketable Securities (Summary of Investment Securities in an Unrealized Loss Position) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/silc-mssoisiaulpd</Role>
      <ShortName>Marketable Securities (Summary of Investment Securities in an Unrealized Loss Position) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://silicom-usa.com/role/silc-mst</ParentRole>
      <Position>46</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>00000049 - Disclosure - Other Receivables (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/OtherReceivablesDetails</Role>
      <ShortName>Other Receivables (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://silicom-usa.com/role/OtherReceivablesTables</ParentRole>
      <Position>47</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>00000050 - Disclosure - Inventories (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/silc-id</Role>
      <ShortName>Inventories (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://silicom-usa.com/role/silc-it</ParentRole>
      <Position>48</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>00000051 - Disclosure - Property, Plant and Equipment, Net (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/silc-ppaend</Role>
      <ShortName>Property, Plant and Equipment, Net (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://silicom-usa.com/role/silc-ppaent</ParentRole>
      <Position>49</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>00000052 - Disclosure - Intangible Assets (Schedule of net intangible assets) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/IntangibleAssetsScheduleOfNetIntangibleAssetsDetails</Role>
      <ShortName>Intangible Assets (Schedule of net intangible assets) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://silicom-usa.com/role/silc-gaoiat</ParentRole>
      <Position>50</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>00000053 - Disclosure - Leases (Schedule of Operating Lease Cost) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/LeasesScheduleOfOperatingLeaseCostDetails</Role>
      <ShortName>Leases (Schedule of Operating Lease Cost) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://silicom-usa.com/role/LeasesTables</ParentRole>
      <Position>51</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>00000054 - Disclosure - Leases (Schedule of Supplemental Cash Flow Information Operating Lease) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/LeasesScheduleOfSupplementalCashFlowInformationOperatingLeaseDetails</Role>
      <ShortName>Leases (Schedule of Supplemental Cash Flow Information Operating Lease) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://silicom-usa.com/role/LeasesTables</ParentRole>
      <Position>52</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>00000055 - Disclosure - Leases (Schedule of Supplemental Balance Sheet Information Operating Lease) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/LeasesScheduleOfSupplementalBalanceSheetInformationOperatingLeaseDetails</Role>
      <ShortName>Leases (Schedule of Supplemental Balance Sheet Information Operating Lease) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://silicom-usa.com/role/LeasesTables</ParentRole>
      <Position>53</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>00000056 - Disclosure - Leases (Schedule of Future Minimum Lease Payments) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/LeasesScheduleOfFutureMinimumLeasePaymentsDetails</Role>
      <ShortName>Leases (Schedule of Future Minimum Lease Payments) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://silicom-usa.com/role/LeasesTables</ParentRole>
      <Position>54</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>00000057 - Disclosure - Assets Held and Liability for Employees' Severance Benefits (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/silc-ahalfesbd</Role>
      <ShortName>Assets Held and Liability for Employees' Severance Benefits (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://silicom-usa.com/role/silc-ahalfesb</ParentRole>
      <Position>55</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>00000058 - Disclosure - Shareholders' Equity (Share Option Plan) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/ShareholdersEquityShareOptionPlanDetails</Role>
      <ShortName>Shareholders' Equity (Share Option Plan) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://silicom-usa.com/role/silc-set</ParentRole>
      <Position>56</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>00000059 - Disclosure - Shareholders' Equity (RSUs Granted in 2014, 2015 and 2017) (Narrative) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/ShareholdersEquityRsusGrantedIn20142015And2017NarrativeDetails</Role>
      <ShortName>Shareholders' Equity (RSUs Granted in 2014, 2015 and 2017) (Narrative) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://silicom-usa.com/role/silc-set</ParentRole>
      <Position>57</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>00000060 - Disclosure - Shareholders' Equity (Stock Options Granted in 2015, 2016 and 2017) (Narrative) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/ShareholdersEquityStockOptionsGrantedIn20152016And2017NarrativeDetails</Role>
      <ShortName>Shareholders' Equity (Stock Options Granted in 2015, 2016 and 2017) (Narrative) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://silicom-usa.com/role/silc-set</ParentRole>
      <Position>58</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>00000061 - Disclosure - Shareholders' Equity (Fair Value Assumptions) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/ShareholdersEquityFairValueAssumptionsDetails</Role>
      <ShortName>Shareholders' Equity (Fair Value Assumptions) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://silicom-usa.com/role/silc-set</ParentRole>
      <Position>59</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>00000062 - Disclosure - Shareholders' Equity (Stock Option Summary) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/silc-sesosd</Role>
      <ShortName>Shareholders' Equity (Stock Option Summary) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://silicom-usa.com/role/silc-set</ParentRole>
      <Position>60</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>00000063 - Disclosure - Shareholders' Equity (Intrinsic Value of Stock Options) (Narrative) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/silc-seivosond</Role>
      <ShortName>Shareholders' Equity (Intrinsic Value of Stock Options) (Narrative) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://silicom-usa.com/role/silc-set</ParentRole>
      <Position>61</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>00000064 - Disclosure - Shareholders' Equity (Stock Option Activity) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/silc-sesoad</Role>
      <ShortName>Shareholders' Equity (Stock Option Activity) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://silicom-usa.com/role/silc-set</ParentRole>
      <Position>62</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>00000065 - Disclosure - Shareholders' Equity (Schedule Of Restricted Share Units Activity) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/silc-sesorsuad</Role>
      <ShortName>Shareholders' Equity (Schedule Of Restricted Share Units Activity) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://silicom-usa.com/role/silc-set</ParentRole>
      <Position>63</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>00000066 - Disclosure - Shareholders' Equity (Intrinsic Value of Restricted Share Units) (Narrative) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/ShareholdersEquityIntrinsicValueOfRestrictedShareUnitsNarrativeDetails</Role>
      <ShortName>Shareholders' Equity (Intrinsic Value of Restricted Share Units) (Narrative) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://silicom-usa.com/role/silc-set</ParentRole>
      <Position>64</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>00000067 - Disclosure - Shareholders' Equity (Summary of Allocation of Stock-Based Compensation Expenses) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/silc-sesoaosced</Role>
      <ShortName>Shareholders' Equity (Summary of Allocation of Stock-Based Compensation Expenses) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://silicom-usa.com/role/silc-set</ParentRole>
      <Position>65</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>00000068 - Disclosure - Geographic areas and major customers (Sales By Geographic Region) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/silc-ssbgrd</Role>
      <ShortName>Geographic areas and major customers (Sales By Geographic Region) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://silicom-usa.com/role/silc-st</ParentRole>
      <Position>66</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>00000069 - Disclosure - Geographic areas and major customers (Sales to Single Customers Exceeding 10% of Sales) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/silc-sstsceosd</Role>
      <ShortName>Geographic areas and major customers (Sales to Single Customers Exceeding 10% of Sales) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://silicom-usa.com/role/silc-st</ParentRole>
      <Position>67</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>00000070 - Disclosure - Geographic areas and major customers (Schedule of Locations of Company's Long Lived Assets) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/GeographicAreasAndMajorCustomersScheduleOfLocationsOfCompanysLongLivedAssetsDetails</Role>
      <ShortName>Geographic areas and major customers (Schedule of Locations of Company's Long Lived Assets) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://silicom-usa.com/role/silc-st</ParentRole>
      <Position>68</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>00000071 - Disclosure - Financial Income (Expenses), Net (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/silc-fiend</Role>
      <ShortName>Financial Income (Expenses), Net (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://silicom-usa.com/role/silc-fient</ParentRole>
      <Position>69</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>00000072 - Disclosure - Taxes on Income (Narrative) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/silc-toind</Role>
      <ShortName>Taxes on Income (Narrative) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://silicom-usa.com/role/silc-toit</ParentRole>
      <Position>70</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>00000073 - Disclosure - Taxes on Income (Income Before Income Taxes and Income Taxes Expense (Benefit) Included in the Consolidated Statements of Operations) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/silc-toiibitaitebiicsood</Role>
      <ShortName>Taxes on Income (Income Before Income Taxes and Income Taxes Expense (Benefit) Included in the Consolidated Statements of Operations) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://silicom-usa.com/role/silc-toit</ParentRole>
      <Position>71</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>00000074 - Disclosure - Taxes on Income (Deferred Tax Assets and Liabilities) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/silc-toiditd</Role>
      <ShortName>Taxes on Income (Deferred Tax Assets and Liabilities) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://silicom-usa.com/role/silc-toit</ParentRole>
      <Position>72</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>00000075 - Disclosure - Taxes on Income (Reconciliation of Statutory Tax Expense To Actual Tax Expense) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/silc-toirostetated</Role>
      <ShortName>Taxes on Income (Reconciliation of Statutory Tax Expense To Actual Tax Expense) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://silicom-usa.com/role/silc-toit</ParentRole>
      <Position>73</Position>
    </Report>
    <Report instance="silc-20191231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>00000076 - Disclosure - Subsequent Events (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://silicom-usa.com/role/SubsequentEventsDetails</Role>
      <ShortName>Subsequent Events (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://silicom-usa.com/role/silc-se1</ParentRole>
      <Position>74</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File>silc-20191231.xml</File>
    <File>silc-20191231.xsd</File>
    <File>silc-20191231_cal.xml</File>
    <File>silc-20191231_def.xml</File>
    <File>silc-20191231_lab.xml</File>
    <File>silc-20191231_pre.xml</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy>http://fasb.org/srt/2019-01-31</BaseTaxonomy>
    <BaseTaxonomy>http://fasb.org/us-gaap/2019-01-31</BaseTaxonomy>
    <BaseTaxonomy>http://xbrl.sec.gov/dei/2019-01-31</BaseTaxonomy>
    <BaseTaxonomy>http://xbrl.sec.gov/country/2017-01-31</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
