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Geographic areas and major customers (Percentage of Net Accounts Receivable Balance) (Details)	12 Months Ended
	Dec. 31, 2017		Dec. 31, 2016
Customer 1 [Member]
Percentage of net accounts receivable	30.00%			[1]
Customer 2 [Member]
Percentage of net accounts receivable	22.00%			[1]
Customer 3 [Member]
Percentage of net accounts receivable	10.00%		11.00%
Customer 4 [Member]
Percentage of net accounts receivable		[1]	11.00%
[1] Less than 10% of Trade accounts receivable, net.

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6404-108592

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13537-108611

+ Details

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Period Type:	duration

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- Details

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- Details

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X

- Details

Name:	us-gaap_MajorCustomersAxis=silc_CustomeThreeMember
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- Details

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