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Note 3 - Construction Joint Ventures (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2015
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Note 3 - Construction Joint Ventures (Details) [Line Items] |
Construction Backlog Attributable to Project Performed by Joint Ventures | $ 24 strl_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

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- Definition Amount of construction backlog attributable to project performed by joint ventures. + References No definition available. + Details
Name: | strl_ConstructionBacklogAttributableToProjectPerformedByJointVentures
Namespace Prefix: | strl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | strl_Note3ConstructionJointVenturesDetailsLineItems
Namespace Prefix: | strl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

X
- Details
Name: | us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=strl_ShimmickConstructionCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |