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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
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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 |  | $ 2,024 strl_NetIncomeAttributableToNoncontrollingInterestIncludedInLiabilities | $ 16,941 strl_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 | 3,797 us-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 |  | 1,875 us-gaap_FairValueOptionChangesInFairValueGainLoss1 / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = strl_RHBMember | 2,473 us-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 | 4,097 us-gaap_MinorityInterestInJointVentures / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 20,046 us-gaap_MinorityInterestInJointVentures / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 18,375 us-gaap_MinorityInterestInJointVentures / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Net income attributable to noncontrolling interest included in liabilities |  | 2,024 strl_NetIncomeAttributableToNoncontrollingInterestIncludedInLiabilities / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 16,941 strl_NetIncomeAttributableToNoncontrollingInterestIncludedInLiabilities / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Net income attributable to noncontrolling interest included in equity | 4,556 us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 1,879 us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 1,068 us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Accretion of interest on puts |  |  | 993 strl_AccretionOfInterestOnPuts / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Issuance of noncontrolling interest in RHB in exchange for net assets of acquired companies |  |  | 9,767 strl_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 | $ 7,462 us-gaap_MinorityInterestInJointVentures / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | $ 4,097 us-gaap_MinorityInterestInJointVentures / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | $ 20,046 us-gaap_MinorityInterestInJointVentures / dei_LegalEntityAxis = us-gaap_SubsidiariesMember

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- Definition Accretion of interest on Puts + References No definition available. + Details
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- Definition Acquisitions Other + References No definition available. + Details
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- Definition Issuance of noncontrolling interest in RHB in exchange for net assets of acquired companies + References No definition available. + Details
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- Definition 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. + References No definition available. + Details
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- Definition This element represents the fair value of the noncontrolling interest in the acquiree at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4613674-111683 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4K -URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591552-111686 + Details
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- Definition For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 + Details
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- Definition Decrease in noncontrolling interest balance from payment of dividends or other distributions by the non-wholly owned subsidiary or partially owned entity, included in the consolidation of the parent entity, to the noncontrolling interest holders. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4568740-111683 + Details
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