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Note 2 - Revenue Recognition - Disaggregation of Revenues, Percentage (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Percentage of net sales	100.00%	100.00%	100.00%	100.00%
Hot Rolled Products [Member]
Percentage of net sales	27.30%	30.40%	29.30%	32.90%
Plate Products [Member]
Percentage of net sales	9.20%	11.80%	10.90%	12.60%
Cold Rolled Products [Member]
Percentage of net sales	6.30%	5.50%	5.80%	5.50%
Coated Products [Member]
Percentage of net sales	12.30%	8.10%	9.50%	7.70%
Specialty [Member]
Percentage of net sales	24.80%	23.40%	22.80%	20.30%
Tube Products [Member]
Percentage of net sales	17.00%	18.50%	18.50%	18.10%
Product and Service, Other [Member]
Percentage of net sales	3.10%	2.30%	3.20%	2.90%
Carbon Flat Products [Member]
Percentage of net sales	56.00%	56.10%	56.70%	59.50%
Carbon Flat Products [Member] | Hot Rolled Products [Member]
Percentage of net sales	27.30%	30.40%	29.30%	32.90%
Carbon Flat Products [Member] | Plate Products [Member]
Percentage of net sales	9.20%	11.80%	10.90%	12.60%
Carbon Flat Products [Member] | Cold Rolled Products [Member]
Percentage of net sales	6.30%	5.50%	5.80%	5.50%
Carbon Flat Products [Member] | Coated Products [Member]
Percentage of net sales	12.30%	8.10%	9.50%	7.70%
Carbon Flat Products [Member] | Specialty [Member]
Percentage of net sales	0.00%	0.00%	0.00%	0.00%
Carbon Flat Products [Member] | Tube Products [Member]
Percentage of net sales	0.00%	0.00%	0.00%	0.00%
Carbon Flat Products [Member] | Product and Service, Other [Member]
Percentage of net sales	0.90%	0.30%	1.20%	0.80%
Specialty Metals Flat Products [Member]
Percentage of net sales	27.00%	25.40%	24.80%	22.40%
Specialty Metals Flat Products [Member] | Hot Rolled Products [Member]
Percentage of net sales	0.00%	0.00%	0.00%	0.00%
Specialty Metals Flat Products [Member] | Plate Products [Member]
Percentage of net sales	0.00%	0.00%	0.00%	0.00%
Specialty Metals Flat Products [Member] | Cold Rolled Products [Member]
Percentage of net sales	0.00%	0.00%	0.00%	0.00%
Specialty Metals Flat Products [Member] | Coated Products [Member]
Percentage of net sales	0.00%	0.00%	0.00%	0.00%
Specialty Metals Flat Products [Member] | Specialty [Member]
Percentage of net sales	24.80%	23.40%	22.80%	20.30%
Specialty Metals Flat Products [Member] | Tube Products [Member]
Percentage of net sales	0.00%	0.00%	0.00%	0.00%
Specialty Metals Flat Products [Member] | Product and Service, Other [Member]
Percentage of net sales	2.20%	2.00%	2.00%	2.10%
Tubular and Pipe Products [Member]
Percentage of net sales	17.00%	18.50%	18.50%	18.10%
Tubular and Pipe Products [Member] | Hot Rolled Products [Member]
Percentage of net sales	0.00%	0.00%	0.00%	0.00%
Tubular and Pipe Products [Member] | Plate Products [Member]
Percentage of net sales	0.00%	0.00%	0.00%	0.00%
Tubular and Pipe Products [Member] | Cold Rolled Products [Member]
Percentage of net sales	0.00%	0.00%	0.00%	0.00%
Tubular and Pipe Products [Member] | Coated Products [Member]
Percentage of net sales	0.00%	0.00%	0.00%	0.00%
Tubular and Pipe Products [Member] | Specialty [Member]
Percentage of net sales	0.00%	0.00%	0.00%	0.00%
Tubular and Pipe Products [Member] | Tube Products [Member]
Percentage of net sales	17.00%	18.50%	18.50%	18.10%
Tubular and Pipe Products [Member] | Product and Service, Other [Member]
Percentage of net sales	0.00%	0.00%	0.00%	0.00%

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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- 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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- Details

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