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Note 3 - Construction Joint Ventures (Details Textual) $ in Millions	Sep. 30, 2015 USD ($)
Shimmick Construction Company [Member]
Equity Method Investment, Ownership Percentage	30.00%
Construction Backlog Attributable to Project Performed by Joint Ventures	$ 11

X

- Definition

Amount of construction backlog attributable to project performed by joint ventures.

+ References

No definition available.

+ Details

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Namespace Prefix:	strl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 323



-SubTopic 10



-Section 50



-Paragraph 3



-Subparagraph (a)(1)



-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

+ Details

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X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: