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Note 4 - Subsidiaries and Joint Ventures With Noncontrolling Owners' Interests (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Members Interest Subject to Mandatory Redemption	$ 40,000		$ 40,000		$ 40,000
Myers [Member]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	50.00%		50.00%
Myers [Member] | Upon Death [Member]
Income (Loss) from Subsidiaries, before Tax	$ 2,600	$ 3,900	$ 2,500	$ 3,900

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

Amount before tax of income (loss) of subsidiary attributable to the parent entity.

+ References

No definition available.

+ Details

Name:	us-gaap_IncomeLossFromSubsidiariesBeforeTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

+ References

No definition available.

+ Details

Name:	us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	dei_LegalEntityAxis=strl_MyersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementScenarioAxis=strl_UponDeathMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: