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Note 3 - Construction Joint Ventures (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015
Note 3 - Construction Joint Ventures (Details) [Line Items]
Construction Backlog Attributable to Project Performed by Joint Ventures	$ 24strl_ConstructionBacklogAttributableToProjectPerformedByJointVentures
Shimmick Construction Company [Member]
Note 3 - Construction Joint Ventures (Details) [Line Items]
Equity Method Investment, Ownership Percentage	30.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = strl_ShimmickConstructionCompanyMember

X

- Definition

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

+ References

No definition available.

+ Details

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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

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