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Note 21 - Subsequent Events - CEO Departure, Goodwill and Covenant Compliance (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 0 Months Ended | 2 Months Ended | 0 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 12, 2015 | Mar. 11, 2015 | Feb. 02, 2015 | Sep. 01, 2015 | Jun. 01, 2015 | Dec. 31, 2014 | Jan. 27, 2015 | Jan. 26, 2015
Note 21 - Subsequent Events - CEO Departure, Goodwill and Covenant Compliance (Details) [Line Items] |  |  |  |  |  |  |  |
Tangible Net Worth |  |  |  |  |  | $ 86.3 strl_TangibleNetWorth |  |
Subsequent Event [Member] | Seventh Amendment [Member] | Prime Rate [Member] |  |  |  |  |  |  |  |
Note 21 - Subsequent Events - CEO Departure, Goodwill and Covenant Compliance (Details) [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 3.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = strl_SeventhAmendmentMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember / us-gaap_VariableRateAxis = us-gaap_PrimeRateMember |  |  |  |  |  |  |
Subsequent Event [Member] | Seventh Amendment [Member] |  |  |  |  |  |  |  |
Note 21 - Subsequent Events - CEO Departure, Goodwill and Covenant Compliance (Details) [Line Items] |  |  |  |  |  |  |  |
Line Of Credit Availability Reduction | 5 strl_LineOfCreditAvailabilityReduction / us-gaap_CreditFacilityAxis = strl_SeventhAmendmentMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 35 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = strl_SeventhAmendmentMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_CreditFacilityAxis = strl_SeventhAmendmentMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |  |  |  |
Tangible Net Worth Headroom | 11.3 strl_TangibleNetWorthHeadroom / us-gaap_CreditFacilityAxis = strl_SeventhAmendmentMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |  |  |  |
Debt Instrument, Fee Amount | 0.4 us-gaap_DebtInstrumentFeeAmount / us-gaap_CreditFacilityAxis = strl_SeventhAmendmentMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |  |  |  |
Debt Instrument, Fee, Number of Equal Payments | 4 strl_DebtInstrumentFeeNumberOfEqualPayments / us-gaap_CreditFacilityAxis = strl_SeventhAmendmentMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |  |  |  |
Subsequent Event [Member] | Prime Rate [Member] |  |  |  |  |  |  |  |
Note 21 - Subsequent Events - CEO Departure, Goodwill and Covenant Compliance (Details) [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember / us-gaap_VariableRateAxis = us-gaap_PrimeRateMember |  |  |  |  |  |
Subsequent Event [Member] | Chief Executive Officer [Member] | Severance Package [Member] |  |  |  |  |  |  |  |
Note 21 - Subsequent Events - CEO Departure, Goodwill and Covenant Compliance (Details) [Line Items] |  |  |  |  |  |  |  |
Salaries, Wages and Officers' Compensation |  |  | 1.8 us-gaap_SalariesWagesAndOfficersCompensation / us-gaap_NatureOfExpenseAxis = strl_SeverancePackageMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |
Note 21 - Subsequent Events - CEO Departure, Goodwill and Covenant Compliance (Details) [Line Items] |  |  |  |  |  |  |  |
Share Price (in Dollars per share) |  |  |  |  |  |  | $ 3.97 us-gaap_SharePrice / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember | $ 5.52 us-gaap_SharePrice / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Debt Instrument, Interest Rate, Stated Percentage |  | 4.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |  |  |
Scenario, Forecast [Member] | Seventh Amendment [Member] |  |  |  |  |  |  |  |
Note 21 - Subsequent Events - CEO Departure, Goodwill and Covenant Compliance (Details) [Line Items] |  |  |  |  |  |  |  |
Line Of Credit Availability Reduction |  |  |  | 10 strl_LineOfCreditAvailabilityReduction / us-gaap_CreditFacilityAxis = strl_SeventhAmendmentMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember | 10 strl_LineOfCreditAvailabilityReduction / us-gaap_CreditFacilityAxis = strl_SeventhAmendmentMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | $ 15 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = strl_SeventhAmendmentMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember | $ 25 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = strl_SeventhAmendmentMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember |  |  |

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- Definition Amount of the fee that accompanies borrowing money under the debt instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -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 19, 22 -Article 5 + Details
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- Definition Expenditures for salaries for officers and non-officers. Does not include allocated share-based compensation, pension and post-retirement benefit expense or other labor-related non-salary expense. For commercial and industrial companies, excludes any direct and overhead labor that is included in cost of goods sold. + References No definition available. + Details
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