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Note 9 - Fair Value of Assets and Liabilities (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Industrial Revenue Bond [Member]
Note 9 - Fair Value of Assets and Liabilities (Details) [Line Items]
Long-term Debt, Fair Value	$ 3.5us-gaap_LongTermDebtFairValue / us-gaap_DebtInstrumentAxis = zeus_IndustrialRevenueBondMember	$ 4.3us-gaap_LongTermDebtFairValue / us-gaap_DebtInstrumentAxis = zeus_IndustrialRevenueBondMember
Term Loan [Member]
Note 9 - Fair Value of Assets and Liabilities (Details) [Line Items]
Long-term Debt, Fair Value		48.9us-gaap_LongTermDebtFairValue / us-gaap_DebtInstrumentAxis = zeus_TermLoanMember
Revolving Credit Facility [Member]
Note 9 - Fair Value of Assets and Liabilities (Details) [Line Items]
Long-term Debt, Fair Value	$ 244.1us-gaap_LongTermDebtFairValue / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember	$ 146.1us-gaap_LongTermDebtFairValue / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember

X

- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

+ Details

Name:	us-gaap_LongTermDebtFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	zeus_Note9FairValueofAssetsandLiabilitiesDetailsLineItems
Namespace Prefix:	zeus_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=zeus_IndustrialRevenueBondMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=zeus_TermLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: