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Note 3 - Variable Interest Entities (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014
Note 3 - Variable Interest Entities (Details) [Line Items] |
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage | 50.00%us-gaap_VariableInterestEntityOwnershipPercentage
Variable Interest Entity Income Percentage | 50.00%strl_VariableInterestEntityIncomePercentage
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Percentage | 50.00%strl_VariableInterestEntityEntityMaximumLossExposurePercentage
Myers [Member] |
Note 3 - Variable Interest Entities (Details) [Line Items] |
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage | 50.00%us-gaap_VariableInterestEntityOwnershipPercentage / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = strl_MyersMember
Long-term Line of Credit, Noncurrent (in Dollars) | 3 us-gaap_LongTermLineOfCredit / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = strl_MyersMember

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- Details
Name: | strl_Note3VariableInterestEntitiesDetailsLineItems
Namespace Prefix: | strl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The reporting entity's maximum amount of exposure (expressed as a percent) to loss as a result of its involvement with the Variable Interest Entity (VIE). + References No definition available. + Details
Name: | strl_VariableInterestEntityEntityMaximumLossExposurePercentage
Namespace Prefix: | strl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Variable Interest Entity Income Percentage + References No definition available. + Details
Name: | strl_VariableInterestEntityIncomePercentage
Namespace Prefix: | strl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The carrying value as of the balance sheet date of the noncurrent portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Line-of-Credit Arrangement -URI http://asc.fasb.org/extlink&oid=6517033 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=28361426&loc=d3e1314-112600 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=28361426&loc=d3e1336-112600 + Details
Name: | us-gaap_LongTermLineOfCredit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 5A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=28200181&loc=SL6759159-111685 + Details
Name: | us-gaap_VariableInterestEntityOwnershipPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |