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Note 8 - Fair Value of Assets and Liabilities (Details Textual) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Revolving Credit Facility [Member]
Long-term Debt, Fair Value	$ 196.2	$ 164.6
Industrial Revenue Bonds [Member]
Long-term Debt, Fair Value	$ 0.9	$ 1.8

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

X

- Details

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