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Note 11 - Line of Credit and Long-Term Debt (Details) (USD $) | 12 Months Ended | 1 Months Ended | 3 Months Ended | 12 Months Ended | 0 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2014 | Jun. 30, 2013 | Dec. 31, 2013 | Dec. 31, 2013 | Apr. 29, 2014 | Dec. 31, 2012
Note 11 - Line of Credit and Long-Term Debt (Details) [Line Items] |  |  |  |  |  |
Long-term Line of Credit | $ 34,601,000 us-gaap_LineOfCredit |  | 7,808,000 us-gaap_LineOfCredit | 7,808,000 us-gaap_LineOfCredit |  |
Line of Credit Facility, Remaining Borrowing Capacity | 2,400,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity |  | 30,200,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity | 30,200,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity |  |
Secured Long-term Debt, Noncurrent | 116,000 us-gaap_SecuredLongTermDebt |  | 189,000 us-gaap_SecuredLongTermDebt | 189,000 us-gaap_SecuredLongTermDebt |  |
Notes Payable, Noncurrent | 3,300,000 us-gaap_LongTermNotesPayable |  |  |  |  |
Secured Debt [Member] |  |  |  |  |  |
Note 11 - Line of Credit and Long-Term Debt (Details) [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount | 1,100,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 3.50%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember |  |  |  |  |
Debt Instrument, Term | 15 years |  |  |  |  |
Secured Long-term Debt, Noncurrent | 100,000 us-gaap_SecuredLongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember |  |  |  |  |
Credit Facility [Member] |  |  |  |  |  |
Note 11 - Line of Credit and Long-Term Debt (Details) [Line Items] |  |  |  |  |  |
Debt Instrument, Increase (Decrease) in Basis Spread on Variable Rate |  | 1.00%strl_DebtInstrumentIncreaseDecreaseInBasisSpreadOnVariableRate / us-gaap_DebtInstrumentAxis = strl_CreditFacilityMember |  |  |  |
Line of Credit Facility, Interest Rate at Period End |  | 4.25%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd / us-gaap_DebtInstrumentAxis = strl_CreditFacilityMember |  |  |  |
Fourth Amendment [Member] | Revised Amount [Member] |  |  |  |  |  |
Note 11 - Line of Credit and Long-Term Debt (Details) [Line Items] |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | 40,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = strl_RevisedAmountMember / us-gaap_DebtInstrumentAxis = strl_FourthAmendmentMember | 40,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = strl_RevisedAmountMember / us-gaap_DebtInstrumentAxis = strl_FourthAmendmentMember |  |
Fourth Amendment [Member] | Previous Amount [Member] |  |  |  |  |  |
Note 11 - Line of Credit and Long-Term Debt (Details) [Line Items] |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  | 50,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = strl_PreviousAmountMember / us-gaap_DebtInstrumentAxis = strl_FourthAmendmentMember
Fourth Amendment [Member] | Removed Option to Increase [Member] |  |  |  |  |  |
Note 11 - Line of Credit and Long-Term Debt (Details) [Line Items] |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  | 50,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = strl_RemovedOptionToIncreaseMember / us-gaap_DebtInstrumentAxis = strl_FourthAmendmentMember
Fourth Amendment [Member] | Fourth Amendment Modification Increase Borrowing Rates [Member] |  |  |  |  |  |
Note 11 - Line of Credit and Long-Term Debt (Details) [Line Items] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 0.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = strl_FourthAmendmentModificationIncreaseBorrowingRatesMember / us-gaap_DebtInstrumentAxis = strl_FourthAmendmentMember |  |  |
Fourth Amendment [Member] | Increase in Basis Points in 2014 [Member] |  |  |  |  |  |
Note 11 - Line of Credit and Long-Term Debt (Details) [Line Items] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 2.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = strl_IncreaseInBasisPointsIn2014Member / us-gaap_DebtInstrumentAxis = strl_FourthAmendmentMember |  |
Fourth Amendment [Member] | Quarterly Increase in Basis Points After 2015 [Member] |  |  |  |  |  |
Note 11 - Line of Credit and Long-Term Debt (Details) [Line Items] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 1.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = strl_QuarterlyIncreaseInBasisPointsAfter2015Member / us-gaap_DebtInstrumentAxis = strl_FourthAmendmentMember |  |
Fourth Amendment [Member] |  |  |  |  |  |
Note 11 - Line of Credit and Long-Term Debt (Details) [Line Items] |  |  |  |  |  |
Line of Credit Facility, Interest Rate at Period End |  |  | 4.75%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd / us-gaap_DebtInstrumentAxis = strl_FourthAmendmentMember | 4.75%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd / us-gaap_DebtInstrumentAxis = strl_FourthAmendmentMember |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  |  |  | 0.75%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage / us-gaap_DebtInstrumentAxis = strl_FourthAmendmentMember |  |
Line of Credit Facility, Increase (Decrease) in Basis Spread on Unused Capacity |  |  |  | 0.25%strl_LineOfCreditFacilityIncreaseDecreaseInBasisSpreadOnUnusedCapacity / us-gaap_DebtInstrumentAxis = strl_FourthAmendmentMember |  |
Fifth Amendment [Member] | Revised Amount [Member] |  |  |  |  |  |
Note 11 - Line of Credit and Long-Term Debt (Details) [Line Items] |  |  |  |  |  |
Debt Instrument Covenant Compliance Minimum New Equity Capital Raised |  |  |  |  | 10,000,000 strl_DebtInstrumentCovenantComplianceMinimumNewEquityCapitalRaised / us-gaap_CreditFacilityAxis = strl_RevisedAmountMember / us-gaap_DebtInstrumentAxis = strl_FifthAmendmentMember |
Fifth Amendment [Member] | Removed Requirement [Member] |  |  |  |  |  |
Note 11 - Line of Credit and Long-Term Debt (Details) [Line Items] |  |  |  |  |  |
Debt Instrument Covenant Compliance Minimum New Equity Capital Raised |  |  |  |  | 20,000,000 strl_DebtInstrumentCovenantComplianceMinimumNewEquityCapitalRaised / us-gaap_CreditFacilityAxis = strl_RemovedRequirementMember / us-gaap_DebtInstrumentAxis = strl_FifthAmendmentMember |
Debt Instrument Covenant Compliance Minimum Other Liquidity Raised |  |  |  |  | 10,000,000 strl_DebtInstrumentCovenantComplianceMinimumOtherLiquidityRaised / us-gaap_CreditFacilityAxis = strl_RemovedRequirementMember / us-gaap_DebtInstrumentAxis = strl_FifthAmendmentMember |
Fifth Amendment [Member] |  |  |  |  |  |
Note 11 - Line of Credit and Long-Term Debt (Details) [Line Items] |  |  |  |  |  |
Repayments of Long-term Lines of Credit |  |  |  |  | 14,000,000 us-gaap_RepaymentsOfLongTermLinesOfCredit / us-gaap_DebtInstrumentAxis = strl_FifthAmendmentMember |
Sixth Amendment [Member] |  |  |  |  |  |
Note 11 - Line of Credit and Long-Term Debt (Details) [Line Items] |  |  |  |  |  |
Debt Instrument Covenant Compliance Maximum Allowable Business Acquisition Purchase Price |  |  |  |  | 8,000,000 strl_DebtInstrumentCovenantComplianceMaximumAllowableBusinessAcquisitionPurchasePrice / us-gaap_DebtInstrumentAxis = strl_SixthAmendmentMember |
Notes Payable for Transportation and Construction Equipment [Member] | Minimum [Member] |  |  |  |  |  |
Note 11 - Line of Credit and Long-Term Debt (Details) [Line Items] |  |  |  |  |  |
Debt Instrument, Term | 3 years |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.12%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = strl_NotesPayableForTransportationAndConstructionEquipmentMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |
Notes Payable for Transportation and Construction Equipment [Member] | Maximum [Member] |  |  |  |  |  |
Note 11 - Line of Credit and Long-Term Debt (Details) [Line Items] |  |  |  |  |  |
Debt Instrument, Term | 5 years |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.29%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = strl_NotesPayableForTransportationAndConstructionEquipmentMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |
Notes Payable for Transportation and Construction Equipment [Member] |  |  |  |  |  |
Note 11 - Line of Credit and Long-Term Debt (Details) [Line Items] |  |  |  |  |  |
Notes Payable, Noncurrent | 3,300,000 us-gaap_LongTermNotesPayable / us-gaap_DebtInstrumentAxis = strl_NotesPayableForTransportationAndConstructionEquipmentMember |  | 500,000 us-gaap_LongTermNotesPayable / us-gaap_DebtInstrumentAxis = strl_NotesPayableForTransportationAndConstructionEquipmentMember | 500,000 us-gaap_LongTermNotesPayable / us-gaap_DebtInstrumentAxis = strl_NotesPayableForTransportationAndConstructionEquipmentMember |  |
Letter of Credit [Member] |  |  |  |  |  |
Note 11 - Line of Credit and Long-Term Debt (Details) [Line Items] |  |  |  |  |  |
Letters of Credit Outstanding, Amount | $ 3,000,000 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember |  | 2,000,000 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember | 2,000,000 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember |  |

X
- Definition Represents the maximum business acquisition purchase price payable in shares of the Company's common stock per the terms of amended Credit Facility. + References No definition available. + Details
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- Definition Represents the minimum amount of new equity capital that must be raised as required by a debt covenant. + References No definition available. + Details
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- Definition Represents the minimum amount of other liquidity that must be raised as required by a debt covenant. + References No definition available. + Details
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- Definition Debt Instrument, Increase (Decrease) in Basis Spread on Variable Rate + References No definition available. + Details
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- Definition Line of Credit Facility, Increase (Decrease) in Basis Spread on Unused Capacity + References No definition available. + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition The effective interest rate at the end of the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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- Definition Carrying value as of the balance sheet date of notes payable (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
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- Definition The cash outflow for the settlement of obligation drawn from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition Carrying amount of collateralized debt obligations with maturities initially due after one year or beyond the operating cycle, if longer, excluding the current portion. Obligations include, but not limited to, mortgage loans, chattel loans, and other borrowings secured by assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
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