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Note 9 - Acquired Subsidiaries with Noncontrolling Owners’ Interests and Earn-out Agreement (Details) - Components of Noncontrolling Interest Subject to Mandatory Redemption (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Components of Noncontrolling Interest Subject to Mandatory Redemption [Abstract]
Member’s interest subject to mandatory redemption	$ 20,000strl_MembersInterestSubjectToMandatoryRedemption	$ 20,000strl_MembersInterestSubjectToMandatoryRedemption
Accumulated undistributed earnings attributable to this interest	5,400us-gaap_UndistributedEarningsOfDomesticSubsidiaries	6,079us-gaap_UndistributedEarningsOfDomesticSubsidiaries
Earnings distributed	(3,200)strl_MandatoryRedemptionEarningsDistributed	(3,200)strl_MandatoryRedemptionEarningsDistributed
Total liability	$ 22,200us-gaap_SharesSubjectToMandatoryRedemptionSettlementTermsAmountNoncurrent	$ 22,879us-gaap_SharesSubjectToMandatoryRedemptionSettlementTermsAmountNoncurrent

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- Details

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X

- Definition

Represents the mandatory earnings distribution to non-controlling interest.

+ References

No definition available.

+ Details

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- Definition

Member’s interest subject to mandatory redemption.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

The amount that is required to be paid, determined under the conditions specified in the contract, if as of the reporting date, the holder of the share has exercised the right to or the shares are mandatorily redeemable after one year from the reporting date or operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 480

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6940734&loc=d3e22047-110879

+ Details

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- Definition

Amount of undistributed earnings of domestic subsidiaries or domestic joint ventures intended to be permanent.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (b)(c)

-URI http://asc.fasb.org/extlink&oid=6424122&loc=d3e41874-109331



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=6424122&loc=d3e41874-109331



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 25

-Paragraph 3

-Subparagraph (a)(2)

-URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28200-109314

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