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Note 5 - Derivative Financial Instruments (Details) (USD $)	3 Months Ended
	Mar. 31, 2014 gal
Note 5 - Derivative Financial Instruments (Details) [Line Items]
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax, Portion Attributable to Parent (in Dollars)	$ 27,000
Price Risk Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net (in Dollars)	$ 14,000
Derivative, Nonmonetary Notional Amount, Gallons	820,000
Minimum [Member]
Note 5 - Derivative Financial Instruments (Details) [Line Items]
Derivative, Nonmonetary, Number of Gallons Range	10,000
Underlying, Derivative Volume (in Dollars per US Gallon)	2.75
Maximum [Member]
Note 5 - Derivative Financial Instruments (Details) [Line Items]
Derivative, Nonmonetary, Number of Gallons Range	50,000
Underlying, Derivative Volume (in Dollars per US Gallon)	2.89

X

- Definition

The number of gallons in a derivative contract expressed in nonmonetary units. For example, the number of gallons specified in a fuel forward purchase contract.

+ References

No definition available.

+ Details

Name:	strl_DerivativeNonmonetaryNotionalAmountGallons
Namespace Prefix:	strl_
Data Type:	num:volumeItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The range in gallons of the derivative contract nonmonetary units. For example, volume in gallons specified in a fuel forward purchase contract.

+ References

No definition available.

+ Details

Name:	strl_DerivativeNonmonetaryNumberOfGallonsRange
Namespace Prefix:	strl_
Data Type:	num:volumeItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	strl_Note5DerivativeFinancialInstrumentsDetailsLineItems
Namespace Prefix:	strl_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of tax expense (benefit), after reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature, attributable to parent entity.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 45

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4569643-111683



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 45

-Paragraph 19

-URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4569616-111683



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 50

-Paragraph 1A

-Subparagraph (c)(3)

-URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684

+ Details

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

X

- Definition

The amount of net gains or losses on price risk cash flow hedges reclassified during the period to earnings from accumulated other comprehensive income.

+ References

No definition available.

+ Details

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

X

- Definition

Specified interest rate, security price, commodity price, foreign exchange rate, index of prices or rates for a derivative contract measured in volume but not the derivative contract itself.

+ References

No definition available.

+ Details

Name:	us-gaap_UnderlyingDerivativeVolume
Namespace Prefix:	us-gaap_
Data Type:	us-types:perUnitItemType
Balance Type:	na
Period Type:	duration