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Note 9 - Fair Value of Assets and Liabilities (Details) - Fair Value Measurements, Not Recorded (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
ABL Credit Facility $ 244,090us-gaap_LongTermLineOfCredit $ 146,075us-gaap_LongTermLineOfCredit
Carrying Value [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total liabilities not recorded at fair value 3,530us-gaap_LongTermDebt
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByLiabilityClassAxis
= zeus_CarryingValueMember
4,340us-gaap_LongTermDebt
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByLiabilityClassAxis
= zeus_CarryingValueMember
Carrying Value [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total liabilities not recorded at fair value 244,090us-gaap_LongTermDebt
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByLiabilityClassAxis
= zeus_CarryingValueMember
194,929us-gaap_LongTermDebt
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByLiabilityClassAxis
= zeus_CarryingValueMember
Carrying Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total liabilities not recorded at fair value 247,620us-gaap_LongTermDebt
/ us-gaap_FairValueByLiabilityClassAxis
= zeus_CarryingValueMember
199,269us-gaap_LongTermDebt
/ us-gaap_FairValueByLiabilityClassAxis
= zeus_CarryingValueMember
Industrial Revenue Bond [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long term debt 3,530us-gaap_LoansPayable
/ us-gaap_DebtInstrumentAxis
= zeus_IndustrialRevenueBondMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
4,340us-gaap_LoansPayable
/ us-gaap_DebtInstrumentAxis
= zeus_IndustrialRevenueBondMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Industrial Revenue Bond [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long term debt 3,530us-gaap_LoansPayable
/ us-gaap_DebtInstrumentAxis
= zeus_IndustrialRevenueBondMember
4,340us-gaap_LoansPayable
/ us-gaap_DebtInstrumentAxis
= zeus_IndustrialRevenueBondMember
Term Loan [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long term debt   48,854us-gaap_LoansPayable
/ us-gaap_DebtInstrumentAxis
= zeus_TermLoanMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Term Loan [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long term debt   48,854us-gaap_LoansPayable
/ us-gaap_DebtInstrumentAxis
= zeus_TermLoanMember
Fair Value, Inputs, Level 2 [Member] | ABL Credit Facility [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
ABL Credit Facility 244,090us-gaap_LongTermLineOfCredit
/ us-gaap_CreditFacilityAxis
= zeus_ABLCreditFacilityMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
146,075us-gaap_LongTermLineOfCredit
/ us-gaap_CreditFacilityAxis
= zeus_ABLCreditFacilityMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
ABL Credit Facility [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
ABL Credit Facility $ 244,090us-gaap_LongTermLineOfCredit
/ us-gaap_CreditFacilityAxis
= zeus_ABLCreditFacilityMember
$ 146,075us-gaap_LongTermLineOfCredit
/ us-gaap_CreditFacilityAxis
= zeus_ABLCreditFacilityMember