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Note 13 - Commitments and Contingencies (Details Textual) | Dec. 31, 2020
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Entity Number of Employees | 269
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 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