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Note 16 - Retirement Plans (Details Textual) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Defined Contribution Plan, Administrative Expenses | $ 2.2 | $ 2.0 | $ 2.2
Multiemployer Plan [Member] | Minimum [Member] |  |  |
Defined Benefit Plan, Funded Percentage | 80.00% |  |
Non-union Flat Rolled Segments’ 401K Retirement Plan [Member] |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay | 6.00% |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Match | 50.00% |  |
Union Flat Rolled Segments' 401K Retirement Plan [Member] |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay | 6.00% |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Match | 50.00% |  |
CTI Location 401K Retirement Plan [Member] |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay | 6.00% |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Match | 50.00% |  |
Supplemental Executive Retirement Plan (SERP) [Member] |  |  |
Defined Contribution Plan, Compensation Percentage Multiplier | 13.00% |  |
Defined Contribution Plan Vesting Period | 5 years |  |

X
- Definition Plan assets of a defined benefit plan, as a percentage of projected benefit obligation. + References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlanFundedPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of administrative expenses incurred by a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanAdministrativeExpenses
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition A portion of the employee's compensation multiplied by a specific percentage. + References No definition available. + Details
Name: | zeus_DefinedContributionPlanCompensationPercentageMultiplier
Namespace Prefix: | zeus_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The vesting period of the employer's matching contributions to a defined contribution plan. + References No definition available. + Details
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Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
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Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
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- Details
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- Details
Name: | us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis=zeus_CTILocation401KRetirementPlanMember
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X
- Details
Name: | us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis=zeus_SupplementalExecutiveRetirementPlanSerpMember
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Data Type: | na
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Period Type: |