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Note 3 - Construction Joint Ventures (Details) (USD $) In Millions, unless otherwise specified | Sep. 30, 2014
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Note 3 - Construction Joint Ventures (Details) [Line Items] |
Construction Backlog, Attributable to Project Performed by Joint Ventures | $ 18
Shimmick Construction Company [Member] |
Note 3 - Construction Joint Ventures (Details) [Line Items] |
Equity Method Investment, Ownership Percentage | 30.00%

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- 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

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- Details
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Data Type: | xbrli:stringItemType
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- 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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