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Note 18 - Concentration of Risk and Enterprise Wide Disclosures (Details) - Contract Revenues by Customers (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
UDOT [Member] |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |
Amount |  | [1] |  | [1] | $ 100,658 us-gaap_ContractsRevenue / us-gaap_MajorCustomersAxis = strl_UDOTMember
Customer % |  | [1] |  | [1] | 16.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_MajorCustomersAxis = strl_UDOTMember
Caltrans [Member] |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |
Amount | $ 97,637 us-gaap_ContractsRevenue / us-gaap_MajorCustomersAxis = strl_CaltransMember |  | $ 92,159 us-gaap_ContractsRevenue / us-gaap_MajorCustomersAxis = strl_CaltransMember |  | $ 94,171 us-gaap_ContractsRevenue / us-gaap_MajorCustomersAxis = strl_CaltransMember
Customer % | 14.50%us-gaap_ConcentrationRiskPercentage1 / us-gaap_MajorCustomersAxis = strl_CaltransMember |  | 16.60%us-gaap_ConcentrationRiskPercentage1 / us-gaap_MajorCustomersAxis = strl_CaltransMember |  | 15.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_MajorCustomersAxis = strl_CaltransMember
[1] | Represents less than 10% of revenues

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13537-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13531-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 + Details
Name: | us-gaap_ConcentrationRiskPercentage1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Revenue earned during the period arising from products sold or services provided under the terms of a contract, not elsewhere specified in the taxonomy. May include government contracts, construction contracts, and any other contract related to a particular project or product. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
Name: | us-gaap_ContractsRevenue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_EntityWideRevenueMajorCustomerLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_MajorCustomersAxis=strl_CaltransMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_MajorCustomersAxis=strl_UDOTMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |