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Note 3 - Revenue Recognition - Disaggregation of Revenues, Percentage (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Percentage of net sales	100.00%	100.00%	100.00%	100.00%
Hot Rolled Products [Member]
Percentage of net sales	30.40%	34.00%	32.90%	35.10%
Plate Products [Member]
Percentage of net sales	11.80%	13.40%	12.60%	12.80%
Cold Rolled Products [Member]
Percentage of net sales	5.50%	5.10%	5.50%	5.30%
Coated Products [Member]
Percentage of net sales	8.10%	7.10%	7.70%	7.60%
Specialty [Member]
Percentage of net sales	23.40%	18.40%	20.30%	18.50%
Tube Products [Member]
Percentage of net sales	18.50%		18.10%
Pipe and Tube Products [Member]
Percentage of net sales		17.90%		17.70%
Product and Service, Other [Member]
Percentage of net sales	2.30%	4.10%	2.90%	3.00%
Carbon Flat Products [Member]
Percentage of net sales	56.10%	61.90%	59.50%	62.50%
Carbon Flat Products [Member] | Hot Rolled Products [Member]
Percentage of net sales	30.40%	34.00%	32.90%	35.10%
Carbon Flat Products [Member] | Plate Products [Member]
Percentage of net sales	11.80%	13.40%	12.60%	12.80%
Carbon Flat Products [Member] | Cold Rolled Products [Member]
Percentage of net sales	5.50%	5.10%	5.50%	5.30%
Carbon Flat Products [Member] | Coated Products [Member]
Percentage of net sales	8.10%	7.10%	7.70%	7.60%
Carbon Flat Products [Member] | Specialty [Member]
Percentage of net sales
Carbon Flat Products [Member] | Tube Products [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	0.30%	2.30%	0.80%	1.70%
Specialty Metals Flat Products [Member]
Percentage of net sales	25.40%	20.20%	22.40%	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	23.40%	18.40%	20.30%	18.50%
Specialty Metals Flat Products [Member] | Tube Products [Member]
Percentage of net sales
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	2.00%	1.80%	2.10%	1.30%
Tubular and Pipe Products [Member]
Percentage of net sales	18.50%	17.90%	18.10%	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] | Tube Products [Member]
Percentage of net sales	18.50%		18.10%
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

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

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Period Type:

X

- Details

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X

- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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X

- Details

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