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Note 6 - Variable Interest Entities (Details Textual)	12 Months Ended
	Dec. 31, 2016
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage	50.00%
Variable Interest Entity, Income Percentage	50.00%
Variable Interest Entity, Entity Maximum Loss Exposure, Percentage	50.00%
Myers [Member]
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage	50.00%

X

- Definition

The reporting entity's maximum amount of exposure (expressed as a percent) to loss as a result of its involvement with the Variable Interest Entity (VIE).

+ References

No definition available.

+ Details

Name:	strl_VariableInterestEntityEntityMaximumLossExposurePercentage
Namespace Prefix:	strl_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage of the Variable Interest Entity's (VIE) income interest in the reporting entity (directly or indirectly).

+ References

No definition available.

+ Details

Name:	strl_VariableInterestEntityIncomePercentage
Namespace Prefix:	strl_
Data Type:	num:percentItemType
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=64801991&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_MyersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: