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Note 1 - Basis of Presentation (Details Textual)	9 Months Ended
	Sep. 30, 2015
Carbon Flat Products and Specialty Metals Flat Products [Member]
Number of Reportable Segments	2
Number of Reportable Segments	3

X

- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfReportableSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=zeus_CarbonFlatProductsAndSpecialtyMetalsFlatProductsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: