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Note 7 - Right of Use Assets (Details Textual) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2019 USD ($) | Jan. 01, 2019 USD ($)
Operating Lease, Right-of-Use Asset | $ 28,756 | $ 30,100
Operating Lease, Liability, Total | 28,817 | $ 30,100
Cleveland Warehouse [Member] |  |
Operating Lease, Annual Expense | $ 200 |
Lessee, Operating Lease, Number of Renewal Term | 3 |
Lessee, Operating Lease, Renewal Term | 5 years |

X
- Definition Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
Name: | us-gaap_LesseeOperatingLeaseRenewalTerm
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

X
- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
Name: | us-gaap_OperatingLeaseLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
Name: | us-gaap_OperatingLeaseRightOfUseAsset
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the number of lessee's operating lease renewal. + References No definition available. + Details
Name: | zeus_LesseeOperatingLeaseNumberOfRenewalTerm
Namespace Prefix: | zeus_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the amount of annual expense for operating lease. + References No definition available. + Details
Name: | zeus_OperatingLeaseAnnualExpense
Namespace Prefix: | zeus_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_LeaseArrangementTypeAxis=zeus_ClevelandWarehouseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |