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Note 6 - Variable Interest Entities (Details Textual) | 12 Months Ended
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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: |