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Note 12 - Income Taxes and Deferred Tax Asset/Liability (Details) - Deferred Tax Assets and Liabilities (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Assets related to: |  |
Valuation allowance for deferred tax assets | $ (36,600)us-gaap_DeferredTaxAssetsValuationAllowance |
Current [Member] |  |
Assets related to: |  |
Accrued compensation and other | 1,059 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits / us-gaap_StatementScenarioAxis = strl_CurrentMember | 265 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits / us-gaap_StatementScenarioAxis = strl_CurrentMember
Deferred revenue | 125 us-gaap_DeferredTaxAssetsDeferredIncome / us-gaap_StatementScenarioAxis = strl_CurrentMember | 6,993 us-gaap_DeferredTaxAssetsDeferredIncome / us-gaap_StatementScenarioAxis = strl_CurrentMember
Valuation allowance for deferred tax assets | (1,184)us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_StatementScenarioAxis = strl_CurrentMember | (7,258)us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_StatementScenarioAxis = strl_CurrentMember
Long-Term [Member] |  |
Assets related to: |  |
Accrued compensation and other | 809 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits / us-gaap_StatementScenarioAxis = strl_LongTermMember | 451 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits / us-gaap_StatementScenarioAxis = strl_LongTermMember
Amortization and impairment of goodwill | 10,816 us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets / us-gaap_StatementScenarioAxis = strl_LongTermMember | 11,108 us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets / us-gaap_StatementScenarioAxis = strl_LongTermMember
Accreted interest to put |  | 985 strl_DeferredTaxAssetsAccretedInterestToPut / us-gaap_StatementScenarioAxis = strl_LongTermMember
Contingency on lawsuit |  | 106 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLegalSettlements / us-gaap_StatementScenarioAxis = strl_LongTermMember
Noncontrolling interest | 2,326 strl_DeferredTaxAssetsNoncontrollingInterest / us-gaap_StatementScenarioAxis = strl_LongTermMember | 1,439 strl_DeferredTaxAssetsNoncontrollingInterest / us-gaap_StatementScenarioAxis = strl_LongTermMember
Revaluation of put/call liabilities | 8,471 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsContingencies / us-gaap_StatementScenarioAxis = strl_LongTermMember | 5,127 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsContingencies / us-gaap_StatementScenarioAxis = strl_LongTermMember
Net operating loss carryforwards | 27,172 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / us-gaap_StatementScenarioAxis = strl_LongTermMember | 18,302 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / us-gaap_StatementScenarioAxis = strl_LongTermMember
Valuation allowance for deferred tax assets | (35,393)us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_StatementScenarioAxis = strl_LongTermMember | (23,773)us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_StatementScenarioAxis = strl_LongTermMember
Liabilities related to: |  |
Depreciation of property and equipment | (14,186)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment / us-gaap_StatementScenarioAxis = strl_LongTermMember | (12,669)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment / us-gaap_StatementScenarioAxis = strl_LongTermMember
Other | $ (15)us-gaap_DeferredTaxLiabilitiesOther / us-gaap_StatementScenarioAxis = strl_LongTermMember | $ (1,076)us-gaap_DeferredTaxLiabilitiesOther / us-gaap_StatementScenarioAxis = strl_LongTermMember

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from accreted interest to put. + References No definition available. + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from non-controlling interest. + References No definition available. + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from deferred income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from intangible assets including goodwill. + References No definition available. + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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- Definition The tax effect as of the balance sheet date of the amount of the estimated future tax deductions arising from employee benefit costs not otherwise specified in the taxonomy, which can only be deducted for tax purposes when actual costs are incurred, and which can only be realized if sufficient tax-basis income is generated in future periods to enable the deduction to be taken. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from contingent liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from the estimated loss from legal settlements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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- Definition Amount of deferred tax liability attributable to taxable temporary differences not separately disclosed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 + Details
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- Definition Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 + Details
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