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Note 2 - Acquisitions and Subsidiaries and Joint Ventures with Noncontrolling Owners' Interests (Details) - Changes in Noncontrolling Owners’ Interests in Subsidiaries and Consolidated Joint Ventures (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Note 2 - Acquisitions and Subsidiaries and Joint Ventures with Noncontrolling Owners' Interests (Details) - Changes in Noncontrolling Owners’ Interests in Subsidiaries and Consolidated Joint Ventures [Line Items]
Net income attributable to noncontrolling interest included in liabilities		$ 2,024strl_NetIncomeAttributableToNoncontrollingInterestIncludedInLiabilities	$ 16,941strl_NetIncomeAttributableToNoncontrollingInterestIncludedInLiabilities
Distributions to noncontrolling interests owners	(994)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	(416)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	(117)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
RLW [Member] | Subsidiaries [Member]
Note 2 - Acquisitions and Subsidiaries and Joint Ventures with Noncontrolling Owners' Interests (Details) - Changes in Noncontrolling Owners’ Interests in Subsidiaries and Consolidated Joint Ventures [Line Items]
Change in fair value or due to amendment		(59)us-gaap_FairValueOptionChangesInFairValueGainLoss1 / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = strl_RLWMember	3,797us-gaap_FairValueOptionChangesInFairValueGainLoss1 / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = strl_RLWMember
RHB [Member] | Subsidiaries [Member]
Note 2 - Acquisitions and Subsidiaries and Joint Ventures with Noncontrolling Owners' Interests (Details) - Changes in Noncontrolling Owners’ Interests in Subsidiaries and Consolidated Joint Ventures [Line Items]
Change in fair value or due to amendment		1,875us-gaap_FairValueOptionChangesInFairValueGainLoss1 / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = strl_RHBMember	2,473us-gaap_FairValueOptionChangesInFairValueGainLoss1 / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = strl_RHBMember
RHB Amendment [Member] | Subsidiaries [Member]
Note 2 - Acquisitions and Subsidiaries and Joint Ventures with Noncontrolling Owners' Interests (Details) - Changes in Noncontrolling Owners’ Interests in Subsidiaries and Consolidated Joint Ventures [Line Items]
Change in fair value or due to amendment		(18,103)us-gaap_FairValueOptionChangesInFairValueGainLoss1 / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = strl_RHBAmendmentMember
Subsidiaries [Member]
Note 2 - Acquisitions and Subsidiaries and Joint Ventures with Noncontrolling Owners' Interests (Details) - Changes in Noncontrolling Owners’ Interests in Subsidiaries and Consolidated Joint Ventures [Line Items]
Balance, beginning of period	4,097us-gaap_MinorityInterestInJointVentures / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	20,046us-gaap_MinorityInterestInJointVentures / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	18,375us-gaap_MinorityInterestInJointVentures / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Net income attributable to noncontrolling interest included in liabilities		2,024strl_NetIncomeAttributableToNoncontrollingInterestIncludedInLiabilities / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	16,941strl_NetIncomeAttributableToNoncontrollingInterestIncludedInLiabilities / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Net income attributable to noncontrolling interest included in equity	4,556us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	1,879us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	1,068us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Accretion of interest on puts			993strl_AccretionOfInterestOnPuts / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Issuance of noncontrolling interest in RHB in exchange for net assets of acquired companies			9,767strl_IssuanceOfNoncontrollingInterestInRHBInExchangeForNetAssetsOfAcquiredCompanies / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Distributions to noncontrolling interests owners	(1,191)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	(3,056)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	(10,185)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Acquisition of RLW noncontrolling interest		(509)us-gaap_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	(23,144)us-gaap_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Other			(39)strl_AcquisitionsOther / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Balance, end of period	$ 7,462us-gaap_MinorityInterestInJointVentures / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	$ 4,097us-gaap_MinorityInterestInJointVentures / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	$ 20,046us-gaap_MinorityInterestInJointVentures / dei_LegalEntityAxis = us-gaap_SubsidiariesMember

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Amount of net income or loss for the period allocated to the noncontrolling interest included in liabilities in order to derive to the portion attributable to the parent.

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This element represents the fair value of the noncontrolling interest in the acquiree at the acquisition date.

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income (loss) and other comprehensive income (loss), attributable to noncontrolling interests. Excludes changes in equity resulting from investments by owners and distributions to owners.

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For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings.

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Carrying amount of the equity interests owned by noncontrolling shareholders, partners, or other equity holders in joint ventures included in the entity's consolidated financial statements.

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