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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			$ 75,000,000strl_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				25,000,000us-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					15,000,000us-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	35,000,000us-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	400,000us-gaap_DebtInstrumentFeeAmount / us-gaap_CreditFacilityAxis = strl_SeventhAmendmentMember
Debt Instrument, Fee, Number of Equal Payments	4strl_DebtInstrumentFeeNumberOfEqualPayments / us-gaap_CreditFacilityAxis = strl_SeventhAmendmentMember

X

- Definition

Represents the number of equal payments of a debt instrument fee.

+ References

No definition available.

+ Details

Name:	strl_DebtInstrumentFeeNumberOfEqualPayments
Namespace Prefix:	strl_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	strl_Note13CreditFacilityandCovenantComplianceDetailsLineItems
Namespace Prefix:	strl_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents tangible net worth.

+ References

No definition available.

+ Details

Name:	strl_TangibleNetWorth
Namespace Prefix:	strl_
Data Type:	xbrli:monetaryItemType
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

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
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

Name:	us-gaap_DebtInstrumentFeeAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- 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

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- 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

X

- Details

Name:	us-gaap_CreditFacilityAxis=strl_SeventhAmendmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementScenarioAxis=us-gaap_ScenarioForecastMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: