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Note 15 - Net Loss Per Share Attributable to Sterling Common Stockholders (Details) - Basic Net Income (Loss) per Share Attributable to Sterling Common Stockholders (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Numerator: |  |  |  |  |  |  |  |  |  |  |
Net loss attributable to Sterling common stockholders | $ (7,251)us-gaap_NetIncomeLoss | $ (3,935)us-gaap_NetIncomeLoss | $ 1,200 us-gaap_NetIncomeLoss | $ 205 us-gaap_NetIncomeLoss | $ (52,135)us-gaap_NetIncomeLoss | $ (189)us-gaap_NetIncomeLoss | $ (17,025)us-gaap_NetIncomeLoss | $ (4,580)us-gaap_NetIncomeLoss | $ (9,781)us-gaap_NetIncomeLoss | $ (73,929)us-gaap_NetIncomeLoss | $ (297)us-gaap_NetIncomeLoss
Revaluation of noncontrolling interest put/call liability reflected in additional paid in capital or retained earnings, net of tax |  |  |  |  |  |  |  |  |  | (7,686)strl_RevaluationOfNoncontrollingInterestObligationsReflectedInRetainedEarningsNetOfTax | (3,992)strl_RevaluationOfNoncontrollingInterestObligationsReflectedInRetainedEarningsNetOfTax
|  |  |  |  |  |  |  |  | $ (9,781)us-gaap_IncomeLossFromContinuingOperations | $ (81,615)us-gaap_IncomeLossFromContinuingOperations | $ (4,289)us-gaap_IncomeLossFromContinuingOperations
Denominator: |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares outstanding — basic (in Shares) |  |  |  |  |  |  |  |  | 18,063,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 16,635,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 16,421,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Weighted average common shares outstanding and assumed conversions— diluted (in Shares) |  |  |  |  |  |  |  |  | 18,063,466 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted | 16,635,179 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted | 16,420,886 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted
Basic and diluted net loss per share attributable to Sterling common stockholders (in Dollars per share) |  |  |  |  |  |  |  |  | $ (0.54)us-gaap_EarningsPerShareBasicAndDiluted | $ (4.91)us-gaap_EarningsPerShareBasicAndDiluted | $ (0.26)us-gaap_EarningsPerShareBasicAndDiluted

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- Definition The revaluation of noncontrolling interest obligations reflected in retained earnings, net of tax. + References No definition available. + Details
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- Definition The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. + References No definition available. + Details
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- Definition Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4613673-111683 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.13) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=6519514 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=6518256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.19) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.18) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.22) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 19 -Article 5 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 20 -Article 9 + Details
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