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Note 1 - Business Summary and Significant Accounting Policies (Details Textual) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Minimum [Member]
Ownership Interest in Joint Venture	50.00%
Revenue Recognition Percentage of Completion Range	1 year
Warranty Term	1 year
Maximum [Member]
Revenue Recognition Percentage of Completion Range	3 years
Warranty Term	2 years
Ownership Interest in Joint Venture	50.00%
Estimated Construction Gross (Loss) Profit, Before Tax	$ 1.2	$ 12.0

X

- Definition

Represents net estimated gross profit (loss) before tax.

+ References

No definition available.

+ Details

Name:	strl_EstimatedConstructionGrossProfitLossBeforeTax
Namespace Prefix:	strl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Represents the ownership interest in joint venture.

+ References

No definition available.

+ Details

Name:	strl_OwnershipInterestInJointVenture
Namespace Prefix:	strl_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the length of time the Company's contracts generally take to complete.

+ References

No definition available.

+ Details

Name:	strl_RevenueRecognitionPercentageOfCompletionRange
Namespace Prefix:	strl_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the warranty term.

+ References

No definition available.

+ Details

Name:	strl_WarrantyTerm
Namespace Prefix:	strl_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: