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Note 16 - Retirement Plans (Details Textual) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
One Half Member [Member] | Non Union Member [Member] |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay | 6.00% |  |
One Half Member [Member] | C T I Location [Member] |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay | 3.00% |  |
Twenty Percent [Member] | C T I Location [Member] |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay | 20.00% |  |
C T I Location [Member] |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay | 3.00% |  |
Supplemental Executive Retirement Plan (SERP) [Member] |  |  |
Defined Contribution Plan, Compensation Percentage Multiplier | 13.00% |  |
Multiemployer Plan [Member] | Minimum [Member] |  |  |
Defined Benefit Plan, Funded Percentage | 80.00% |  |
Defined Contribution Plan Vesting Period | 5 years |  |
Defined Contribution Plan, Administrative Expenses | $ 2.0 | $ 2.2 | $ 2.2

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 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
Name: | zeus_DefinedContributionPlanVestingPeriod
Namespace Prefix: | zeus_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | zeus_MatchAmountAxis=zeus_OneHalfMemberMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis=zeus_NonUnionMemberMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis=zeus_CTILocationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | zeus_MatchAmountAxis=zeus_TwentyPercentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_PlanNameAxis=zeus_MultiemployerPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |