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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: |