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Note 18 - Concentration of Risk and Enterprise Wide Disclosures (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Note 18 - Concentration of Risk and Enterprise Wide Disclosures (Details) [Line Items]
Receivables, Long-term Contracts or Programs	$ 78,896us-gaap_ReceivablesLongTermContractsOrPrograms	$ 77,245us-gaap_ReceivablesLongTermContractsOrPrograms
Foursquare Properties Inc [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]
Note 18 - Concentration of Risk and Enterprise Wide Disclosures (Details) [Line Items]
Receivables, Long-term Contracts or Programs	8,500us-gaap_ReceivablesLongTermContractsOrPrograms / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = strl_FoursquarePropertiesIncMember	11,400us-gaap_ReceivablesLongTermContractsOrPrograms / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = strl_FoursquarePropertiesIncMember
TxDOT [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]
Note 18 - Concentration of Risk and Enterprise Wide Disclosures (Details) [Line Items]
Receivables, Long-term Contracts or Programs	7,600us-gaap_ReceivablesLongTermContractsOrPrograms / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = strl_TxDOTMember
CTMC [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]
Note 18 - Concentration of Risk and Enterprise Wide Disclosures (Details) [Line Items]
Receivables, Long-term Contracts or Programs		16,300us-gaap_ReceivablesLongTermContractsOrPrograms / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = strl_CTMCMember
City of Honolulu [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]
Note 18 - Concentration of Risk and Enterprise Wide Disclosures (Details) [Line Items]
Receivables, Long-term Contracts or Programs		10,000us-gaap_ReceivablesLongTermContractsOrPrograms / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = strl_CityOfHonoluluMember
NTTA [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]
Note 18 - Concentration of Risk and Enterprise Wide Disclosures (Details) [Line Items]
Receivables, Long-term Contracts or Programs			$ 8,800us-gaap_ReceivablesLongTermContractsOrPrograms / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = strl_NTTAMember

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Amount to be collected within one year of the balance sheet date (or one operating cycle, if longer) from customers in accordance with the contractual provisions of long-term contracts or programs including amounts billed and unbilled as of the balance sheet date.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.3(c))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 3

-Subparagraph c

-Article 5

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