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Note 7 - Fair Value of Financial Instruments (Details) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Note 7 - Fair Value of Financial Instruments (Details) [Line Items]    
Long-term Line of Credit, Noncurrent $ 234,100,000us-gaap_LongTermLineOfCredit $ 244,090,000us-gaap_LongTermLineOfCredit
Fair Value, Inputs, Level 1 [Member] | Industrial Revenue Bond [Member]    
Note 7 - Fair Value of Financial Instruments (Details) [Line Items]    
Long-term Debt, Fair Value 3,500,000us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= zeus_IndustrialRevenueBondMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
3,500,000us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= zeus_IndustrialRevenueBondMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Industrial Revenue Bond [Member]    
Note 7 - Fair Value of Financial Instruments (Details) [Line Items]    
Long-term Debt 3,500,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= zeus_IndustrialRevenueBondMember
3,500,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= zeus_IndustrialRevenueBondMember
Revolving Credit Facility [Member]    
Note 7 - Fair Value of Financial Instruments (Details) [Line Items]    
Long-term Line of Credit, Noncurrent $ 234,100,000us-gaap_LongTermLineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
$ 244,100,000us-gaap_LongTermLineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember