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Note 7 - Stock-based Compensation Expense Recognized on Restricted Stock Units (Details) - Restricted Stock Units (RSUs) [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Expense Before Tax [Member]
RSU expense (income) before taxes	$ (570)	$ 311	$ (332)	$ 542
Expense After Tax [Member]
RSU expense (income) before taxes	$ (289)	$ 191	$ (160)	$ 317

X

- Definition

Represents the (income)/expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

No definition available.

+ Details

Name:	zeus_AllocatedShareBasedCompensationIncomeExpense
Namespace Prefix:	zeus_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_RestrictedStockUnitsRSUMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_NatureOfExpenseAxis=zeus_ExpenseBeforeTaxMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_NatureOfExpenseAxis=zeus_ExpenseAfterTaxMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: