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Note 7 - Income Taxes (Details) - Summary Reconciliation Reported Amount of Income Tax Expense (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Summary Reconciliation Reported Amount of Income Tax Expense [Abstract]
Tax expense (benefit) at the U.S. federal statutory rate	$ (5,843)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 168us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Tax expense (benefit) at the U.S. federal statutory rate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State tax based on income, net of refunds and federal benefits	(309)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	5us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
State tax based on income, net of refunds and federal benefits	1.90%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	1.00%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Taxes on subsidiaries’ earnings allocated to noncontrolling interests owners	133us-gaap_IncomeTaxReconciliationEquityInEarningsLossesOfUnconsolidatedSubsidiary	(165)us-gaap_IncomeTaxReconciliationEquityInEarningsLossesOfUnconsolidatedSubsidiary
Taxes on subsidiaries’ earnings allocated to noncontrolling interests owners	(0.80%)us-gaap_EffectiveIncomeTaxRateReconciliationEquityInEarningsLossesOfUnconsolidatedSubsidiary	(34.40%)us-gaap_EffectiveIncomeTaxRateReconciliationEquityInEarningsLossesOfUnconsolidatedSubsidiary
Valuation allowance	5,699us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	(55)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Valuation allowance	(34.20%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	(11.50%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Other permanent differences	323us-gaap_IncomeTaxReconciliationOtherAdjustments	47us-gaap_IncomeTaxReconciliationOtherAdjustments
Other permanent differences	(1.90%)strl_EffectiveIncomeTaxRateReconciliationOnPermenantDifferences	9.90%strl_EffectiveIncomeTaxRateReconciliationOnPermenantDifferences
Income tax expense	$ 3us-gaap_IncomeTaxExpenseBenefit

X

- Definition

The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate applied to permanent differences.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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