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Note 13 - Covenants Compliance (Details) (USD $) In Millions, unless otherwise specified				12 Months Ended				0 Months Ended		6 Months Ended
	Jun. 30, 2014 Fourth Amendment [Member] Revised Amount [Member]	Jun. 30, 2014 Fourth Amendment [Member] Previous Amount [Member]	Jun. 30, 2014 Fourth Amendment [Member] Removed Option To Increase [Member]	Dec. 31, 2013 Fourth Amendment [Member] Fourth Amendment Modification Increase Borrowing Rates [Member]	Dec. 31, 2013 Fourth Amendment [Member] Increase In Basis Points in 2014[Member]	Dec. 31, 2013 Fourth Amendment [Member] Quarterly Increase In Basis Points After 2015[Member]	Dec. 31, 2013 Fourth Amendment [Member]	Apr. 29, 2014 Fifth Amendment [Member] Revised Amount [Member]	Apr. 29, 2014 Fifth Amendment [Member] Removed Requirement [Member]	Jun. 30, 2014 Fifth Amendment [Member]	May 06, 2014 Revised Amount [Member]
Note 13 - Covenants Compliance (Details) [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 40	$ 50	$ 50								$ 40
Debt Instrument, Basis Spread on Variable Rate				0.50%	2.00%	1.00%
Line of Credit Facility, Interest Rate at Period End							4.75%
Line of Credit Facility, Commitment Fee Percentage							0.75%
Debt Instrument, Covenant Compliance, Minimum New Equity Capital Raised								10	20
Debt Instrument, Covenant Compliance, Minimum Other Liquidity Raised									10
Repayments of Long-term Lines of Credit										$ 14

X

- Definition

Represents the minimum amount of new equity capital that must be raised as required by a debt covenant.

+ References

No definition available.

+ Details

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Namespace Prefix:	strl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Represents the minimum amount of other liquidity that must be raised as required by a debt covenant.

+ References

No definition available.

+ Details

Name:	strl_DebtInstrumentCovenantComplianceMinimumOtherLiquidityRaised
Namespace Prefix:	strl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	strl_Note13CovenantsComplianceDetailsLineItems
Namespace Prefix:	strl_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The effective interest rate at the end of the reporting period.

+ 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_LineOfCreditFacilityInterestRateAtPeriodEnd
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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The cash outflow for the settlement of obligation drawn from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585



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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration