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Note 9 - Derivative Financial Instruments (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 gal | Dec. 31, 2013 | Dec. 31, 2012
Note 9 - Derivative Financial Instruments (Details) [Line Items] |  |  |
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax | $ (0.1)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax | $ 0.1 us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax |
Price Risk Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net | $ (0.1)us-gaap_PriceRiskCashFlowHedgeGainOrLossReclassifiedToEarningsNet | $ 0.1 us-gaap_PriceRiskCashFlowHedgeGainOrLossReclassifiedToEarningsNet | $ (0.1)us-gaap_PriceRiskCashFlowHedgeGainOrLossReclassifiedToEarningsNet
Derivative, Nonmonetary Notional Amount, Gallons (in US Gallons) | 100,000 strl_DerivativeNonmonetaryNotionalAmountGallons |  |
Minimum [Member] |  |  |
Note 9 - Derivative Financial Instruments (Details) [Line Items] |  |  |
Derivative, Nonmonetary, Number of Gallons Range (in US Gallons) | 10,000 strl_DerivativeNonmonetaryNumberOfGallonsRange / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Underlying, Derivative Volume (in Dollars per US Gallon) | 2.75 us-gaap_UnderlyingDerivativeVolume / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Maximum [Member] |  |  |
Note 9 - Derivative Financial Instruments (Details) [Line Items] |  |  |
Derivative, Nonmonetary, Number of Gallons Range (in US Gallons) | 15,000 strl_DerivativeNonmonetaryNumberOfGallonsRange / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Underlying, Derivative Volume (in Dollars per US Gallon) | 2.79 us-gaap_UnderlyingDerivativeVolume / us-gaap_RangeAxis = us-gaap_MaximumMember |  |

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- Definition The number of gallons in a derivative contract expressed in nonmonetary units. For example, the number of gallons specified in a fuel forward purchase contract. + References No definition available. + Details
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Data Type: | num:volumeItemType
Balance Type: | na
Period Type: | duration

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- Definition The range in gallons of the derivative contract nonmonetary units. For example, volume in gallons specified in a fuel forward purchase contract. + References No definition available. + Details
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- Details
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- Definition Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80784-113994 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition The amount of net gains or losses on price risk cash flow hedges reclassified during the period to earnings from accumulated other comprehensive income. + References No definition available. + Details
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Balance Type: | credit
Period Type: | duration

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- Definition Specified interest rate, security price, commodity price, foreign exchange rate, index of prices or rates for a derivative contract measured in volume but not the derivative contract itself. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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