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Note 17 - Employee Benefit Plans (Details) (USD $)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013	Dec. 31, 2012
Note 17 - Employee Benefit Plans (Details) [Line Items]
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 1,300,000us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount		$ 1,100,000us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount	$ 1,300,000us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Multiemployer Plan, Period Contributions	10,808,000us-gaap_MultiemployerPlanPeriodContributions	[1]	6,435,000us-gaap_MultiemployerPlanPeriodContributions	5,541,000us-gaap_MultiemployerPlanPeriodContributions
Individually Insignificant Multiemployer Pension Costs [Member]
Note 17 - Employee Benefit Plans (Details) [Line Items]
Multiemployer Plan, Period Contributions	$ 903,000us-gaap_MultiemployerPlanPeriodContributions / us-gaap_StatementScenarioAxis = strl_IndividuallyInsignificantMultiemployerPensionCostsMember		$ 603,000us-gaap_MultiemployerPlanPeriodContributions / us-gaap_StatementScenarioAxis = strl_IndividuallyInsignificantMultiemployerPensionCostsMember	$ 466,000us-gaap_MultiemployerPlanPeriodContributions / us-gaap_StatementScenarioAxis = strl_IndividuallyInsignificantMultiemployerPensionCostsMember
Red Zone [Member]
Note 17 - Employee Benefit Plans (Details) [Line Items]
Multiemployer Plans, Collective-Bargaining Arrangement, Percentage of Contributions	65.00%us-gaap_MultiemployerPlansCollectiveBargainingArrangementPercentageOfContributions / us-gaap_MultiemployerPlanTypeAxis = strl_RedZoneMember
Orange Zone [Member]
Note 17 - Employee Benefit Plans (Details) [Line Items]
Multiemployer Plans, Collective-Bargaining Arrangement, Percentage of Contributions	80.00%us-gaap_MultiemployerPlansCollectiveBargainingArrangementPercentageOfContributions / us-gaap_MultiemployerPlanTypeAxis = strl_OrangeZoneMember
Yellow Zone [Member]
Note 17 - Employee Benefit Plans (Details) [Line Items]
Multiemployer Plans, Collective-Bargaining Arrangement, Percentage of Contributions	80.00%us-gaap_MultiemployerPlansCollectiveBargainingArrangementPercentageOfContributions / us-gaap_MultiemployerPlanTypeAxis = strl_YellowZoneMember
Green Zone [Member] | Minimum [Member]
Note 17 - Employee Benefit Plans (Details) [Line Items]
Multiemployer Plans, Collective-Bargaining Arrangement, Percentage of Contributions	80.00%us-gaap_MultiemployerPlansCollectiveBargainingArrangementPercentageOfContributions / us-gaap_MultiemployerPlanTypeAxis = strl_GreenZoneMember / us-gaap_RangeAxis = us-gaap_MinimumMember
[1] Indicates whether the plan has a financial improvement plan ("FIP") or a rehabilitation plan ("RP") which is either pending or has been implemented.

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- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

+ References

No definition available.

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- Definition

Amount of contributions made to multiemployer plans by the employer. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 80

-Section 50

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450702-114947



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 80

-Section 50

-Paragraph 9

-URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450691-114947



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 80

-Section 50

-Paragraph 5

-Subparagraph (e)(1)

-URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450657-114947

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Percentage of contributions required by a collective bargaining arrangement to contributions required by all collective bargaining arrangements related to a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 80

-Section 50

-Paragraph 5

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450657-114947

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