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Note 6 - Variable Interest Entities (Details Textual) | 6 Months Ended
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Jun. 30, 2017
Myers [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=77990344&loc=SL6759159-111685 + Details
Name: | us-gaap_VariableInterestEntityOwnershipPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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