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Note 13 - Credit Facility and Covenant Compliance (Details) (USD $) | 0 Months Ended | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 12, 2015 | Dec. 31, 2014 | Apr. 30, 2015 | Jun. 01, 2015 | Sep. 01, 2015
Subsequent Event [Member] | Seventh Amendment [Member] |  |  |  |  |
Note 13 - Credit Facility and Covenant Compliance (Details) [Line Items] |  |  |  |  |
Tangible Net Worth |  |  | $ 75,000,000 strl_TangibleNetWorth / us-gaap_CreditFacilityAxis = strl_SeventhAmendmentMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |
Scenario, Forecast [Member] | Seventh Amendment [Member] |  |  |  |  |
Note 13 - Credit Facility and Covenant Compliance (Details) [Line Items] |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | 25,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = strl_SeventhAmendmentMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember |
Scenario, Forecast [Member] | Removed Option to Increase [Member] |  |  |  |  |
Note 13 - Credit Facility and Covenant Compliance (Details) [Line Items] |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  | 15,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = strl_RemovedOptionToIncreaseMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember
Seventh Amendment [Member] | Prime Rate [Member] |  |  |  |  |
Note 13 - Credit Facility 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_VariableRateAxis = us-gaap_PrimeRateMember | 1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = strl_SeventhAmendmentMember / us-gaap_VariableRateAxis = us-gaap_PrimeRateMember |  |  |
Seventh Amendment [Member] |  |  |  |  |
Note 13 - Credit Facility and Covenant Compliance (Details) [Line Items] |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 35,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = strl_SeventhAmendmentMember |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_CreditFacilityAxis = strl_SeventhAmendmentMember | 4.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_CreditFacilityAxis = strl_SeventhAmendmentMember |  |  |
Debt Instrument, Fee Amount | 400,000 us-gaap_DebtInstrumentFeeAmount / us-gaap_CreditFacilityAxis = strl_SeventhAmendmentMember |  |  |  |
Debt Instrument, Fee, Number of Equal Payments | 4 strl_DebtInstrumentFeeNumberOfEqualPayments / us-gaap_CreditFacilityAxis = strl_SeventhAmendmentMember |  |  |  |

X
- Definition Represents the number of equal payments of a debt instrument fee. + References No definition available. + Details
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Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Details
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Balance Type: | na
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- Definition Represents tangible net worth. + References No definition available. + Details
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Balance Type: | debit
Period Type: | instant

X
- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- 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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Balance Type: | debit
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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
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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- Details
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Period Type: |

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- Details
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Data Type: | na
Balance Type: |
Period Type: |