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Note 12 - Income Taxes and Deferred Tax Asset/Liability (Details) - Summary Reconciliation Reported Amount of Income Tax Expense (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Summary Reconciliation Reported Amount of Income Tax Expense [Abstract]      
Tax expense (benefit) at the U.S. federal statutory rate $ (1,608)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ (24,081)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 5,997us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Tax expense (benefit) at the U.S. federal statutory rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State tax based on income, net of refunds and federal benefits (155)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes (1,280)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes (58)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
State tax based on income, net of refunds and federal benefits 3.40%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 1.80%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes (0.30%)us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Taxes on subsidiaries’ and joint ventures’ earnings allocated to noncontrolling interests owners (2,365)us-gaap_IncomeTaxReconciliationEquityInEarningsLossesOfUnconsolidatedSubsidiary (1,375)us-gaap_IncomeTaxReconciliationEquityInEarningsLossesOfUnconsolidatedSubsidiary (5,938)us-gaap_IncomeTaxReconciliationEquityInEarningsLossesOfUnconsolidatedSubsidiary
Taxes on subsidiaries’ and joint ventures’ earnings allocated to noncontrolling interests owners 51.50%us-gaap_EffectiveIncomeTaxRateReconciliationEquityInEarningsLossesOfUnconsolidatedSubsidiary 2.00%us-gaap_EffectiveIncomeTaxRateReconciliationEquityInEarningsLossesOfUnconsolidatedSubsidiary (34.70%)us-gaap_EffectiveIncomeTaxRateReconciliationEquityInEarningsLossesOfUnconsolidatedSubsidiary
Tax benefits of Domestic Production Activities Deduction     (84)us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities
Tax benefits of Domestic Production Activities Deduction     (0.50%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities
Valuation Allowance 4,152us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance 28,215us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance  
Valuation Allowance (90.40%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance (41.00%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance  
Reduction of tax receivable 524strl_IncomeTaxReconciliationReductionOfTaxReceivable    
Reduction of tax receivable (11.40%)strl_EffectiveIncomeTaxRateReconciliationReductionOfTaxReceivable    
Non-taxable interest income   (195)us-gaap_IncomeTaxReconciliationTaxExemptIncome (529)us-gaap_IncomeTaxReconciliationTaxExemptIncome
Non-taxable interest income   0.30%us-gaap_EffectiveIncomeTaxRateReconciliationMinorityInterestIncomeExpense (3.10%)us-gaap_EffectiveIncomeTaxRateReconciliationMinorityInterestIncomeExpense
Other permanent differences 84us-gaap_IncomeTaxReconciliationOtherAdjustments (62)us-gaap_IncomeTaxReconciliationOtherAdjustments 33us-gaap_IncomeTaxReconciliationOtherAdjustments
Other permanent differences (1.90%)strl_EffectiveIncomeTaxRateReconciliationOnPermenantDifferences 0.10%strl_EffectiveIncomeTaxRateReconciliationOnPermenantDifferences 0.20%strl_EffectiveIncomeTaxRateReconciliationOnPermenantDifferences
Income tax expense (benefit) $ 632us-gaap_IncomeTaxExpenseBenefit $ 1,222us-gaap_IncomeTaxExpenseBenefit $ (579)us-gaap_IncomeTaxExpenseBenefit
Income tax expense (benefit) (13.80%)strl_EffectiveIncomeTaxRateReconciliationAtIncomeTaxRateTotal (1.80%)strl_EffectiveIncomeTaxRateReconciliationAtIncomeTaxRateTotal (3.40%)strl_EffectiveIncomeTaxRateReconciliationAtIncomeTaxRateTotal