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Note 11 - Commitments and Contingencies (Details Textual) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Operating Leases, Rent Expense | $ 8.7 | $ 8.2 | $ 7.5
Entity Number of Employees | 305 |  |
Collective Bargaining Arrangements | 9 |  |

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 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