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Note 9 - Fair Value of Assets and Liabilities (Details) - Fair Value Measurements, Recorded (Fair Value, Measurements, Recurring [Member], USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Note 9 - Fair Value of Assets and Liabilities (Details) - Fair Value Measurements, Recorded [Line Items]    
Embedded customer derivatives $ 487us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeAsset $ 614us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeAsset
Total assets at fair value 487us-gaap_DerivativeAssets 614us-gaap_DerivativeAssets
Total liabilities at fair value 1,051us-gaap_DerivativeLiabilities 1,603us-gaap_DerivativeLiabilities
Fair Value, Inputs, Level 2 [Member] | Metals Swap [Member]    
Note 9 - Fair Value of Assets and Liabilities (Details) - Fair Value Measurements, Recorded [Line Items]    
Metals swaps 487us-gaap_DerivativeLiabilitiesCurrent
/ us-gaap_DerivativeInstrumentRiskAxis
= zeus_MetalsSwapMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
614us-gaap_DerivativeLiabilitiesCurrent
/ us-gaap_DerivativeInstrumentRiskAxis
= zeus_MetalsSwapMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member] | ABL Credit Facility [Member]    
Note 9 - Fair Value of Assets and Liabilities (Details) - Fair Value Measurements, Recorded [Line Items]    
Interest rate swap 386us-gaap_InterestRateDerivativeLiabilitiesAtFairValue
/ us-gaap_CreditFacilityAxis
= zeus_ABLCreditFacilityMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
710us-gaap_InterestRateDerivativeLiabilitiesAtFairValue
/ us-gaap_CreditFacilityAxis
= zeus_ABLCreditFacilityMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member] | Chicago Tube and Iron Company Acquisition [Member]    
Note 9 - Fair Value of Assets and Liabilities (Details) - Fair Value Measurements, Recorded [Line Items]    
Interest rate swap 178us-gaap_InterestRateDerivativeLiabilitiesAtFairValue
/ us-gaap_BusinessAcquisitionAxis
= zeus_ChicagoTubeAndIronCompanyAcquisitionMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
279us-gaap_InterestRateDerivativeLiabilitiesAtFairValue
/ us-gaap_BusinessAcquisitionAxis
= zeus_ChicagoTubeAndIronCompanyAcquisitionMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
Fair Value, Inputs, Level 2 [Member]    
Note 9 - Fair Value of Assets and Liabilities (Details) - Fair Value Measurements, Recorded [Line Items]    
Embedded customer derivatives 487us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeAsset
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
614us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeAsset
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
Total assets at fair value 487us-gaap_DerivativeAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
614us-gaap_DerivativeAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
Total liabilities at fair value 1,051us-gaap_DerivativeLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
1,603us-gaap_DerivativeLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
Metals Swap [Member]    
Note 9 - Fair Value of Assets and Liabilities (Details) - Fair Value Measurements, Recorded [Line Items]    
Metals swaps 487us-gaap_DerivativeLiabilitiesCurrent
/ us-gaap_DerivativeInstrumentRiskAxis
= zeus_MetalsSwapMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
614us-gaap_DerivativeLiabilitiesCurrent
/ us-gaap_DerivativeInstrumentRiskAxis
= zeus_MetalsSwapMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
Interest Rate Swap [Member] | ABL Credit Facility [Member]    
Note 9 - Fair Value of Assets and Liabilities (Details) - Fair Value Measurements, Recorded [Line Items]    
Interest rate swap 386us-gaap_InterestRateDerivativeLiabilitiesAtFairValue
/ us-gaap_CreditFacilityAxis
= zeus_ABLCreditFacilityMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
710us-gaap_InterestRateDerivativeLiabilitiesAtFairValue
/ us-gaap_CreditFacilityAxis
= zeus_ABLCreditFacilityMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
Interest Rate Swap [Member] | Chicago Tube and Iron Company Acquisition [Member]    
Note 9 - Fair Value of Assets and Liabilities (Details) - Fair Value Measurements, Recorded [Line Items]    
Interest rate swap $ 178us-gaap_InterestRateDerivativeLiabilitiesAtFairValue
/ us-gaap_BusinessAcquisitionAxis
= zeus_ChicagoTubeAndIronCompanyAcquisitionMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
$ 279us-gaap_InterestRateDerivativeLiabilitiesAtFairValue
/ us-gaap_BusinessAcquisitionAxis
= zeus_ChicagoTubeAndIronCompanyAcquisitionMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember