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Note 8 - Goodwill (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Oct. 01, 2014
Note 8 - Goodwill (Details) [Line Items]
Percentage Fair Value Of Equity Above Carrying Value Of Equity	13.00%strl_PercentageFairValueOfEquityAboveCarryingValueOfEquity
Goodwill, Impairment Loss	$ 0us-gaap_GoodwillImpairmentLoss
2014 Step One Test [Member]
Note 8 - Goodwill (Details) [Line Items]
Percentage Fair Value Of Equity Above Carrying Value Of Equity	19.00%strl_PercentageFairValueOfEquityAboveCarryingValueOfEquity / us-gaap_ValuationTechniqueAxis = strl_StepOne2014TestMember
Fair Value, Inputs, Level 1 [Member]
Note 8 - Goodwill (Details) [Line Items]
Share Price	$ 6.39us-gaap_SharePrice / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	$ 7.54us-gaap_SharePrice / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member

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- Definition

Represents the percentage of the company fair value of equity above the carrying value of equity.

+ References

No definition available.

+ Details

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- Definition

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 2

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13777-109266



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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- Definition

Price of a single share of a number of saleable stocks of a company.

+ References

No definition available.

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