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Note 11 - Segment Information (Details) - Segment Reporting Information by Capital Expenditures - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Capital expenditures
Capital Expenditures	$ 2,542	$ 2,783	$ 4,233	$ 5,124
Flat Products [Member]
Capital expenditures
Capital Expenditures	918	2,214	2,106	3,230
Tubular and Pipe Products [Member]
Capital expenditures
Capital Expenditures	$ 1,624	552	$ 2,127	1,873
Corporate Segment [Member]
Capital expenditures
Capital Expenditures		$ 17		$ 21

X

- Definition

Expenses incurred during the reporting period regarding the purchases of fixed assets.

+ References

No definition available.

+ Details

Name:	zeus_CapitalExpenditures
Namespace Prefix:	zeus_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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

X

- Details

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

X

- Details

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

X

- Details

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