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Note 1 - Business Summary and Significant Accounting Policies (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	0 Months Ended		3 Months Ended		12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Note 1 - Business Summary and Significant Accounting Policies (Details) [Line Items]
Ownership Interest In Subsidiary			50.00%strl_OwnershipInterestInSubsidiary
Estimated Construction Gross Profit, Before Tax (in Dollars)			$ (12.0)strl_EstimatedConstructionGrossProfitBeforeTax	$ 2.7strl_EstimatedConstructionGrossProfitBeforeTax
Estimated Construction Gross Profit Per Diluted Share (in Dollars per share)			$ (0.63)strl_EstimatedConstructionGrossProfitPerDilutedShare	$ 0.16strl_EstimatedConstructionGrossProfitPerDilutedShare
Contract Receivable Discounted Percentage			4.25%strl_ContractReceivableDiscountedPercentage
Interest Revenue (Expense), Net (in Dollars)			0.1us-gaap_InterestRevenueExpenseNet	0.1us-gaap_InterestRevenueExpenseNet
Mortgage Loans on Real Estate, Number of Loans	1us-gaap_MortgageLoansOnRealEstateNumberOfLoans	1us-gaap_MortgageLoansOnRealEstateNumberOfLoans
Mortgage Loans on Real Estate (in Dollars)	0.1us-gaap_MortgageLoansOnRealEstate	0.1us-gaap_MortgageLoansOnRealEstate	0.1us-gaap_MortgageLoansOnRealEstate		0.1us-gaap_MortgageLoansOnRealEstate
Mortgage Loans on Real Estate, Interest Rate			3.50%us-gaap_MortgageLoansOnRealEstateInterestRate		3.50%us-gaap_MortgageLoansOnRealEstateInterestRate
Notes Payable, Noncurrent (in Dollars)	2.7us-gaap_LongTermNotesPayable		2.7us-gaap_LongTermNotesPayable
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum			3.12%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum			6.29%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
Out of Period Adjustment (in Dollars)			$ 2.8strl_OutOfPeriodAdjustment
Minimum [Member]
Note 1 - Business Summary and Significant Accounting Policies (Details) [Line Items]
Ownership Interest In Joint Venture			50.00%strl_OwnershipInterestInJointVenture / us-gaap_RangeAxis = us-gaap_MinimumMember
Revenue Recognition Percentage of Completion Range			12 months
Warranty Term			1 year
Debt Instrument Payment Term			3 years
Maximum [Member]
Note 1 - Business Summary and Significant Accounting Policies (Details) [Line Items]
Revenue Recognition Percentage of Completion Range			36 months
Warranty Term			2 years
Debt Instrument Payment Term			5 years

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- Definition

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Adjustment made in the current period related to out of period corrections.

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Ownership Interest In Joint Venture

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Revenue Recognition Percentage of Completion Range

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- Definition

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- Definition

Maximum contractual interest rate for funds borrowed, under the debt agreement.

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Minimum contractual interest rate for funds borrowed, under the debt agreement.

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Amount of interest revenue (income derived from investments in debt securities and on cash and cash equivalents) net of interest expense (cost of borrowed funds accounted for as interest).

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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.

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Total carrying amount of mortgage loans as of the balance sheet date.

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The stated interest rate on the mortgage loan receivable or the weighted average interest rate on a group of loans.

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Indicates the number of mortgages under each classification.

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