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Leases (Schedule of Supplemental Cash Flow Information Operating Lease) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Leases [Abstract] |  |
Operating cash flows from operating leases | $ 1,601 | $ 1,541
Right-of-use assets obtained in exchange for lease obligations (non-cash): |  |
Operating leases | $ 7,201 | $ 1,524

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- Definition Operating cash flows from operating leases. + References No definition available. + Details
Name: | silc_OperatingCashFlowsFromOperatingLeases
Namespace Prefix: | silc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Operating leases right of use. + References No definition available. + Details
Name: | silc_OperatingLeasesRightOfUseAssets
Namespace Prefix: | silc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Right-of-use assets obtained in exchange for lease obligations (non-cash): + References No definition available. + Details
Name: | silc_RightofuseAssetsObtainedInExchangeForLeaseObligationsNoncash
Namespace Prefix: | silc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_LeasesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration