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Note 3 - Revenue Recognition - Disaggregation of Revenues, Percentage (Details)	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018
Percentage of net sales	100.00%	100.00%
Hot Rolled Products [Member]
Percentage of net sales	34.00%	35.10%
Plate Products [Member]
Percentage of net sales	13.40%	12.80%
Cold Rolled Products [Member]
Percentage of net sales	5.10%	5.30%
Coated Products [Member]
Percentage of net sales	7.10%	7.60%
Specialty [Member]
Percentage of net sales	18.40%	18.50%
Pipe and Tube Products [Member]
Percentage of net sales	17.90%	17.70%
Product and Service, Other [Member]
Percentage of net sales	4.10%	3.00%
Carbon Flat Products [Member]
Percentage of net sales	61.90%	62.50%
Carbon Flat Products [Member] | Hot Rolled Products [Member]
Percentage of net sales	34.00%	35.10%
Carbon Flat Products [Member] | Plate Products [Member]
Percentage of net sales	13.40%	12.80%
Carbon Flat Products [Member] | Cold Rolled Products [Member]
Percentage of net sales	5.10%	5.30%
Carbon Flat Products [Member] | Coated Products [Member]
Percentage of net sales	7.10%	7.60%
Carbon Flat Products [Member] | Specialty [Member]
Percentage of net sales
Carbon Flat Products [Member] | Pipe and Tube Products [Member]
Percentage of net sales
Carbon Flat Products [Member] | Product and Service, Other [Member]
Percentage of net sales	2.30%	1.70%
Specialty Metals Flat Products [Member]
Percentage of net sales	20.20%	19.80%
Specialty Metals Flat Products [Member] | Hot Rolled Products [Member]
Percentage of net sales
Specialty Metals Flat Products [Member] | Plate Products [Member]
Percentage of net sales
Specialty Metals Flat Products [Member] | Cold Rolled Products [Member]
Percentage of net sales
Specialty Metals Flat Products [Member] | Coated Products [Member]
Percentage of net sales
Specialty Metals Flat Products [Member] | Specialty [Member]
Percentage of net sales	18.40%	18.50%
Specialty Metals Flat Products [Member] | Pipe and Tube Products [Member]
Percentage of net sales
Specialty Metals Flat Products [Member] | Product and Service, Other [Member]
Percentage of net sales	1.80%	1.30%
Tubular and Pipe Products [Member]
Percentage of net sales	17.90%	17.70%
Tubular and Pipe Products [Member] | Hot Rolled Products [Member]
Percentage of net sales
Tubular and Pipe Products [Member] | Plate Products [Member]
Percentage of net sales
Tubular and Pipe Products [Member] | Cold Rolled Products [Member]
Percentage of net sales
Tubular and Pipe Products [Member] | Coated Products [Member]
Percentage of net sales
Tubular and Pipe Products [Member] | Specialty [Member]
Percentage of net sales
Tubular and Pipe Products [Member] | Pipe and Tube Products [Member]
Percentage of net sales	17.90%	17.70%
Tubular and Pipe Products [Member] | Product and Service, Other [Member]
Percentage of net sales

X

- Definition

Percentage of revenue, including tax collected from customer, from satisfaction of performance obligation by transferring promised good or service to customer.

+ References

No definition available.

+ Details

Name:	zeus_RevenueFromContractWithCustomerIncludingAssessedTaxPercentage
Namespace Prefix:	zeus_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_ProductOrServiceAxis=zeus_HotRolledProductsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=zeus_PlateProductsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=zeus_ColdRolledProductsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=zeus_CoatedProductsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=zeus_SpecialtyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=zeus_PipeAndTubeProductsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=us-gaap_ProductAndServiceOtherMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=zeus_CarbonFlatProductsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=zeus_SpecialtyMetalsFlatProductsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=zeus_TubularAndPipeProductsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: