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Note 6 - Components of Noncontrolling Interest Subject to Mandatory Redemption (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Members’ interest subject to mandatory redemption	$ 40,000	$ 40,000
Net accumulated earnings	6,211	10,438
Total liability	$ 46,211	$ 50,438

X

- Definition

The Member's interest subject to mandatory redemption.

+ References

No definition available.

+ Details

Name:	strl_MembersInterestSubjectToMandatoryRedemption
Namespace Prefix:	strl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The element that represents the member's interest subject to mandatory redemption and undistributed earnings.

+ References

No definition available.

+ Details

Name:	strl_MembersInterestSubjectToMandatoryRedemptionAndUndistributedEarnings
Namespace Prefix:	strl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The net amount of undistributed earnings (distributed earnings) of domestic subsidiaries or domestic joint ventures intended to be permanent.

+ References

No definition available.

+ Details

Name:	strl_UndistributedEarningsOfDomesticSubsidiariesNet
Namespace Prefix:	strl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant