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Note 11 - Variable Interest Entities (Details) (Myers [Member]) | 3 Months Ended
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Mar. 31, 2015
Myers [Member] |
Note 11 - Variable Interest Entities (Details) [Line Items] |
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage | 50.00%us-gaap_VariableInterestEntityOwnershipPercentage / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = strl_MyersMember

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- Details
Name: | strl_Note11VariableInterestEntitiesDetailsLineItems
Namespace Prefix: | strl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 5A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=28200181&loc=SL6759159-111685 + Details
Name: | us-gaap_VariableInterestEntityOwnershipPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration