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Note 3 - Subsidiaries and Joint Ventures with Noncontrolling Owners' Interests (Details Textual)	Mar. 31, 2017
Myers [Member]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	50.00%

X

- Definition

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

+ References

No definition available.

+ Details

Name:	us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	dei_LegalEntityAxis=strl_MyersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: