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Note 19 - Related Party Transactions (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Note 19 - Related Party Transactions (Details) [Line Items]
Related Party Transaction, Amounts of Transaction	$ 0.4us-gaap_RelatedPartyTransactionAmountsOfTransaction	$ 0.4us-gaap_RelatedPartyTransactionAmountsOfTransaction	$ 0.4us-gaap_RelatedPartyTransactionAmountsOfTransaction
Operating Leases, Rent Expense	1.6us-gaap_LeaseAndRentalExpense	0.9us-gaap_LeaseAndRentalExpense	1.2us-gaap_LeaseAndRentalExpense
RLW [Member] | Less Than [Member]
Note 19 - Related Party Transactions (Details) [Line Items]
Related Party Transaction, Amounts of Transaction		0.2us-gaap_RelatedPartyTransactionAmountsOfTransaction / us-gaap_RangeAxis = strl_LessThanMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = strl_RLWMember	0.2us-gaap_RelatedPartyTransactionAmountsOfTransaction / us-gaap_RangeAxis = strl_LessThanMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = strl_RLWMember
RLW [Member] | Main Office [Member]
Note 19 - Related Party Transactions (Details) [Line Items]
Operating Leases, Rent Expense	0.2us-gaap_LeaseAndRentalExpense / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = strl_MainOfficeMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = strl_RLWMember
RLW [Member] | Common Area Maintenance [Member]
Note 19 - Related Party Transactions (Details) [Line Items]
Operating Leases, Rent Expense	0.1us-gaap_LeaseAndRentalExpense / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = strl_CommonAreaMaintenanceMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = strl_RLWMember
RLW [Member] | Less Than [Member]
Note 19 - Related Party Transactions (Details) [Line Items]
Related Party Transaction, Amounts of Transaction	0.2us-gaap_RelatedPartyTransactionAmountsOfTransaction / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = strl_LessThanMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = strl_RLWMember
RLW [Member]
Note 19 - Related Party Transactions (Details) [Line Items]
Revenue from Related Parties	0.5us-gaap_RevenueFromRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = strl_RLWMember	0.2us-gaap_RevenueFromRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = strl_RLWMember	0.1us-gaap_RevenueFromRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = strl_RLWMember
Related Party Transaction, Amounts of Transaction		$ 0.9us-gaap_RelatedPartyTransactionAmountsOfTransaction / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = strl_RLWMember	$ 1.0us-gaap_RelatedPartyTransactionAmountsOfTransaction / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = strl_RLWMember

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X

- Definition

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

No definition available.

+ Details

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- Definition

Amount of transactions with related party during the financial reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 850

-SubTopic 10

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39622-107864



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 850

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 850

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

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- Definition

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

+ 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(e))

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Related Parties

-URI http://asc.fasb.org/extlink&oid=16382449



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 946

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.6-07.1(c))

-URI http://asc.fasb.org/extlink&oid=6488393&loc=d3e606610-122999



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 07

-Paragraph b

-Subparagraph 1

-Article 6

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