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Note 10 - Variable Interest Entities (Details Textual)	9 Months Ended
	Sep. 30, 2015
Myers and Sons Construction [Member]
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage	50.00%

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=52262685&loc=SL6759159-111685

+ Details

Name:	us-gaap_VariableInterestEntityOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis=strl_MyersAndSonsConstructionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: