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Note 11 - Variable Interest Entities (Details) (Myers [Member])	3 Months Ended
	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

X

- Details

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Namespace Prefix:	strl_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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

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