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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
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Note 18 - Concentration of Risk and Enterprise Wide Disclosures (Details) [Line Items] |  |  |
Receivables, Long-term Contracts or Programs | $ 78,896 us-gaap_ReceivablesLongTermContractsOrPrograms | $ 77,245 us-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 | 8,500 us-gaap_ReceivablesLongTermContractsOrPrograms / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = strl_FoursquarePropertiesIncMember | 11,400 us-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 | 7,600 us-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 |  | 16,300 us-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 |  | 10,000 us-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 |  |  | $ 8,800 us-gaap_ReceivablesLongTermContractsOrPrograms / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = strl_NTTAMember

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- Definition 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 + Details
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