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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: