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Schedule III - Supplemental Financial Information (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Income Tax Expenses (Benefits) Related to US Tax Cuts and Jobs Act	$ 6,200
Tubular and Pipe Products [Member]
Inventory, LIFO Reserve, Effect on Income, Net	$ 2,707	$ 1,489

X

- Definition

The difference between the change in the inventory reserve representing the cumulative difference in cost between the first in, first out and the last in, first out inventory valuation methods and any LIFO decrement which have been reflected in the statement of income during the period.

+ References

No definition available.

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X

- Definition

The amount of income tax expenses (benefits) recorded during the period related to US tax cuts and jobs act.

+ References

No definition available.

+ Details

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Namespace Prefix:	zeus_
Data Type:	xbrli:monetaryItemType
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Period Type:	duration

X

- Details

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