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Note 12 - Commitments and Contingencies (Details Textual) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Operating Leases, Rent Expense, Total | $ 11.9 | $ 9.7 | $ 9.1
Entity Number of Employees | 315 |  |
Collective Bargaining Arrangements | 9 |  |
General and Administrative Expense [Member] |  |  |
Litigation Settlement, Expense |  | $ 1.0 |
Cost of Materials Sold [Member] |  |  |
Litigation Settlement, Expense |  |  | $ 1.7

X
- Definition Number of persons employed by the Entity + References No definition available. + Details
Name: | dei_EntityNumberOfEmployees
Namespace Prefix: | dei_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
Name: | us-gaap_LeaseAndRentalExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of litigation expense, including but not limited to legal, forensic, accounting, and investigative fees. + References No definition available. + Details
Name: | us-gaap_LitigationSettlementExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Total number of collective bargaining units. + References No definition available. + Details
Name: | zeus_CollectiveBargainingArrangements
Namespace Prefix: | zeus_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_GeneralAndAdministrativeExpenseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=zeus_CostOfMaterialsSoldMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |