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Note 11 - Segment Reporting Information by Capital Expenditures (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Specialty Metal Flat Products [Member]
Capital expenditures
Capital expenditures	$ 1,145	$ 1,148	$ 3,930	$ 3,254
Tubular And Pipe Products [Member]
Capital expenditures
Capital expenditures	593	636	1,405	2,763
Corporate Segment [Member]
Capital expenditures
Capital expenditures
Capital expenditures	$ 1,738	$ 1,784	$ 5,335	$ 6,017

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_SpecialtyMetalFlatProductsMember
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: