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Note 11 - Segment Information (Details) - Segment Reporting Information by Capital Expenditures (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2015 | Mar. 31, 2014
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |
Capital Expenditures | $ 1,691 zeus_CapitalExpenditures | $ 2,341 zeus_CapitalExpenditures
Flat Products [Member] |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |
Capital Expenditures | 1,188 zeus_CapitalExpenditures / us-gaap_StatementBusinessSegmentsAxis = zeus_FlatProductsMember | 1,017 zeus_CapitalExpenditures / us-gaap_StatementBusinessSegmentsAxis = zeus_FlatProductsMember
Tubular and Pipe Products [Member] |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |
Capital Expenditures | 503 zeus_CapitalExpenditures / us-gaap_StatementBusinessSegmentsAxis = zeus_TubularandPipeProductsMember | 1,320 zeus_CapitalExpenditures / us-gaap_StatementBusinessSegmentsAxis = zeus_TubularandPipeProductsMember
Corporate Segment [Member] |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |
Capital Expenditures |  | $ 4 zeus_CapitalExpenditures / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember

X
- Details
Name: | us-gaap_SegmentReportingOtherSignificantReconcilingItemLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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: |