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Note 7 - Construction Joint Ventures (Details Textual) $ in Millions	Sep. 30, 2016 USD ($)
Granite Construction Corporation [Member]
Equity Method Investment, Ownership Percentage	49.00%
Construction Backlog Attributable to Project Performed by Joint Ventures	$ 61

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=66011266&loc=d3e33918-111571

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=strl_GraniteConstructionCorporationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: