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Note 10 - Stockholders' Equity (Details) (USD $)	3 Months Ended		0 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 09, 2015	Jan. 01, 2015
Note 10 - Stockholders' Equity (Details) [Line Items]
Allocated Share-based Compensation Expense	$ 200,000us-gaap_AllocatedShareBasedCompensationExpense	$ 200,000us-gaap_AllocatedShareBasedCompensationExpense
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	4,000,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	2 years 292 days
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options	0us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions	0us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
Proceeds from Stock Options Exercised	0us-gaap_ProceedsFromStockOptionsExercised	0us-gaap_ProceedsFromStockOptionsExercised
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares)	0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
D.A. Davidson & Co. [Member]
Note 10 - Stockholders' Equity (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number (in Shares)	901,136us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_SubsidiarySaleOfStockAxis = strl_DADavidsonCoMember
Chief Executive Officer [Member]
Note 10 - Stockholders' Equity (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares)			600,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember
Annual Salary to be Paid to Employee			1strl_AnnualSalaryToBePaidToEmployee / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			3 years
Long Term Incentive Plan [Member]
Note 10 - Stockholders' Equity (Details) [Line Items]
Allocated Share-based Compensation Expense				$ 100,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_PlanNameAxis = strl_LongTermIncentivePlanMember
Percentage of Incentive Plan Based on Service Completion				50.00%strl_PercentageOfIncentivePlanBasedOnServiceCompletion / us-gaap_PlanNameAxis = strl_LongTermIncentivePlanMember
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period				3 years
Percentage of Incentive Plan Based on Shareholder Return				50.00%strl_PercentageOfIncentivePlanBasedOnShareholderReturn / us-gaap_PlanNameAxis = strl_LongTermIncentivePlanMember
Incentive Plan, Term for Shareholder Return				3 years

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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.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Unrecognized cost of unvested options awarded to employees as compensation.

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Gross number of share options (or share units) granted during the period.

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