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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
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
UDOT [Member]
Revenue, Major Customer [Line Items]
Amount		[1]		[1]	$ 100,658us-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	$ 97,637us-gaap_ContractsRevenue / us-gaap_MajorCustomersAxis = strl_CaltransMember		$ 92,159us-gaap_ContractsRevenue / us-gaap_MajorCustomersAxis = strl_CaltransMember		$ 94,171us-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

X

- 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

X

- 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

X

- Details

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

X

- Details

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

X

- Details

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