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Note 3 - Revenue Recognition - Disaggregation of Revenues, Percentage (Details) | 12 Months Ended
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Dec. 31, 2018
Percentage of net sales | 100.00%
Hot Rolled Products [Member] |
Percentage of net sales | 35.20%
Plate Products [Member] |
Percentage of net sales | 12.90%
Cold Rolled Products [Member] |
Percentage of net sales | 5.40%
Coated Products [Member] |
Percentage of net sales | 7.40%
Specialty [Member] |
Percentage of net sales | 20.00%
Pipe and Tube Products [Member] |
Percentage of net sales | 17.40%
Product and Service, Other [Member] |
Percentage of net sales | 1.70%
Carbon Flat Products [Member] |
Percentage of net sales | 62.60%
Carbon Flat Products [Member] | Hot Rolled Products [Member] |
Percentage of net sales | 35.20%
Carbon Flat Products [Member] | Plate Products [Member] |
Percentage of net sales | 12.90%
Carbon Flat Products [Member] | Cold Rolled Products [Member] |
Percentage of net sales | 5.40%
Carbon Flat Products [Member] | Coated Products [Member] |
Percentage of net sales | 7.40%
Carbon Flat Products [Member] | Specialty [Member] |
Percentage of net sales |
Carbon Flat Products [Member] | Pipe and Tube Products [Member] |
Percentage of net sales |
Carbon Flat Products [Member] | Product and Service, Other [Member] |
Percentage of net sales | 1.70%
Specialty Metals Flat Products [Member] |
Percentage of net sales | 20.00%
Specialty Metals Flat Products [Member] | Hot Rolled Products [Member] |
Percentage of net sales |
Specialty Metals Flat Products [Member] | Plate Products [Member] |
Percentage of net sales |
Specialty Metals Flat Products [Member] | Cold Rolled Products [Member] |
Percentage of net sales |
Specialty Metals Flat Products [Member] | Coated Products [Member] |
Percentage of net sales |
Specialty Metals Flat Products [Member] | Specialty [Member] |
Percentage of net sales | 20.00%
Specialty Metals Flat Products [Member] | Pipe and Tube Products [Member] |
Percentage of net sales |
Specialty Metals Flat Products [Member] | Product and Service, Other [Member] |
Percentage of net sales | 0.00%
Tubular and Pipe Products [Member] |
Percentage of net sales | 17.40%
Tubular and Pipe Products [Member] | Hot Rolled Products [Member] |
Percentage of net sales |
Tubular and Pipe Products [Member] | Plate Products [Member] |
Percentage of net sales |
Tubular and Pipe Products [Member] | Cold Rolled Products [Member] |
Percentage of net sales |
Tubular and Pipe Products [Member] | Coated Products [Member] |
Percentage of net sales |
Tubular and Pipe Products [Member] | Specialty [Member] |
Percentage of net sales |
Tubular and Pipe Products [Member] | Pipe and Tube Products [Member] |
Percentage of net sales | 17.40%
Tubular and Pipe Products [Member] | Product and Service, Other [Member] |
Percentage of net sales |

X
- Definition Percentage of revenue, including tax collected from customer, from satisfaction of performance obligation by transferring promised good or service to customer. + References No definition available. + Details
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Namespace Prefix: | zeus_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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

X
- Details
Name: | srt_ProductOrServiceAxis=zeus_PlateProductsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- 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: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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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: |

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