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Summary of Significant Accounting Policies (Depreciation of Property, Plant and Equipment) (Details)	12 Months Ended
	Dec. 31, 2017
Machinery and equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Straight-line depreciation rate	15.00%
Machinery and equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Straight-line depreciation rate	33.00%
Office Furniture and Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Straight-line depreciation rate	6.00%
Office Furniture and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Straight-line depreciation rate	33.00%
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Straight-line depreciation rate		[1]
[1] Over the shorter term of the lease or the life of the asset

X

- Definition

Straight-Line Depreciation Rate

+ References

No definition available.

+ Details

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Namespace Prefix:	silc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_OfficeEquipmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_LeaseholdImprovementsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: