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Note 7 - Contingencies Related to Litigation (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended
	Jan. 31, 2010
Litigation Settlement, Gross	$ 1.0
Litigation Settlement Bond	$ 1.3

X

- Definition

Element represents the expense of bond to cover court judgement.

+ References

No definition available.

+ Details

Name:	strl_LitigationSettlementBond
Namespace Prefix:	strl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

This element represents the gross amount awarded, to be received by, or to be remitted to the entity in settlement of litigation occurring during the period.

+ References

No definition available.

+ Details

Name:	us-gaap_LitigationSettlementGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration