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Note 18 - Quarterly Financial Information (Details Textual) $ in Millions | 3 Months Ended
--- | ---
Dec. 31, 2016 USD ($)
Global Settlement Which Allowed Closeout of a Texas Project [Member] |
Litigation Settlement, Expense | $ 2.5

X
- Definition Amount of litigation expense, including but not limited to legal, forensic, accounting, and investigative fees. + References No definition available. + Details
Name: | us-gaap_LitigationSettlementExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_LitigationCaseAxis=strl_GlobalSettlementWhichAllowedCloseoutOfATexasProjectMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |