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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

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- Definition Expenses incurred during the reporting period regarding the purchases of fixed assets. + References No definition available. + Details
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Namespace Prefix: | zeus_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | zeus_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |