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Note 16 - Stockholders' Equity (Details) - Summary of 2001 Plan for Restricted Stock Grants (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Note 16 - Stockholders' Equity (Details) - Summary of 2001 Plan for Restricted Stock Grants [Line Items] |  |  |
Total compensation cost attributable to shares awarded | 800,000 us-gaap_AllocatedShareBasedCompensationExpense |  | 700,000 us-gaap_AllocatedShareBasedCompensationExpense
Restricted Stock [Member] | Non-Employee Director [Member] |  |  |
Note 16 - Stockholders' Equity (Details) - Summary of 2001 Plan for Restricted Stock Grants [Line Items] |  |  |
Shares awarded to each non-employee director | 6,203 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_TitleOfIndividualAxis = strl_NonEmployeeDirectorMember | 4,975 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_TitleOfIndividualAxis = strl_NonEmployeeDirectorMember | 5,155 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_TitleOfIndividualAxis = strl_NonEmployeeDirectorMember
Restricted Stock [Member] |  |  |
Note 16 - Stockholders' Equity (Details) - Summary of 2001 Plan for Restricted Stock Grants [Line Items] |  |  |
Shares awarded to each non-employee director | 43,421 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 34,825 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 30,930 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Average grant-date market price per share | 8.06 strl_AverageGrantDateMarketPricePerShare / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 10.06 strl_AverageGrantDateMarketPricePerShare / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 9.70 strl_AverageGrantDateMarketPricePerShare / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Total compensation cost attributable to shares awarded | 350,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 350,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 300,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Compensation cost recognized related to current and prior year awards | 316,750 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 333,499 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 283,333 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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