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Note 6 - Derivative Instruments (Details) - Impact to Consolidated Statements of Operations of Derivatives (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Note 6 - Derivative Instruments (Details) - Impact to Consolidated Statements of Operations of Derivatives [Line Items] |  |
Derivative Instrument | $ (116)us-gaap_GainLossOnFairValueHedgesRecognizedInEarnings | $ (153)us-gaap_GainLossOnFairValueHedgesRecognizedInEarnings
Chicago Tube and Iron Company Acquisition [Member] | Interest Rate Swap [Member] |  |
Note 6 - Derivative Instruments (Details) - Impact to Consolidated Statements of Operations of Derivatives [Line Items] |  |
Derivative Instrument | (17)us-gaap_GainLossOnFairValueHedgesRecognizedInEarnings / us-gaap_BusinessAcquisitionAxis = zeus_ChicagoTubeAndIronCompanyAcquisitionMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember | (29)us-gaap_GainLossOnFairValueHedgesRecognizedInEarnings / us-gaap_BusinessAcquisitionAxis = zeus_ChicagoTubeAndIronCompanyAcquisitionMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember
Interest Rate Swap [Member] | ABL Credit Facility [Member] |  |
Note 6 - Derivative Instruments (Details) - Impact to Consolidated Statements of Operations of Derivatives [Line Items] |  |
Derivative Instrument | (99)us-gaap_GainLossOnFairValueHedgesRecognizedInEarnings / us-gaap_CreditFacilityAxis = zeus_ABLCreditFacilityMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember | (124)us-gaap_GainLossOnFairValueHedgesRecognizedInEarnings / us-gaap_CreditFacilityAxis = zeus_ABLCreditFacilityMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember
Metals Swap [Member] |  |
Note 6 - Derivative Instruments (Details) - Impact to Consolidated Statements of Operations of Derivatives [Line Items] |  |
Derivative Instrument | (1,117)us-gaap_GainLossOnFairValueHedgesRecognizedInEarnings / us-gaap_DerivativeInstrumentRiskAxis = zeus_MetalsSwapMember | 655 us-gaap_GainLossOnFairValueHedgesRecognizedInEarnings / us-gaap_DerivativeInstrumentRiskAxis = zeus_MetalsSwapMember
Embedded Derivative Financial Instruments [Member] |  |
Note 6 - Derivative Instruments (Details) - Impact to Consolidated Statements of Operations of Derivatives [Line Items] |  |
Derivative Instrument | $ 1,117 us-gaap_GainLossOnFairValueHedgesRecognizedInEarnings / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember | $ (655)us-gaap_GainLossOnFairValueHedgesRecognizedInEarnings / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember

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- Definition Total amount of gain (loss) derived from fair value hedges recognized in earnings in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 + Details
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