XML 52 R30.htm IDEA: XBRL DOCUMENT v2.4.1.9

Note 1 - Summary of Business and Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2014

Disclosure Text Block [Abstract]

Schedule of Property, Plant, and Equipment Useful Lives [Table Text Block]

Buildings (years)		39
Construction equipment (years)	5	-	15
Land improvements (years)	5	-	15
Office furniture and fixtures (years)	3	-	10
Leasehold improvements (years or lease period, if shorter)	3	-	10
Transportation equipment (years)		5

X

- Definition

Schedule of Property, Plant, and Equipment Useful Lives [Table Text Block]

+ References

No definition available.

+ Details

Name:	strl_ScheduleOfPropertyPlantAndEquipmentUsefulLivesTableTextBlock
Namespace Prefix:	strl_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Details

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