Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Price of a single share of a number of saleable stocks of a company.

+ References

No definition available.

+ Details

Name:	us-gaap_SharePrice
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Intrinsic value of equity-based compensation awards vested. Excludes stock and unit options.

+ References

No definition available.

+ Details

Name:	us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Restricted Stock Units converted to shares.

+ References

No definition available.

+ Details

Name:	zeus_RestrictedStockUnitsUnitsNumberConverted
Namespace Prefix:	zeus_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of shares distributed to participants who purchase the required amount on the open market.

+ References

No definition available.

+ Details

Name:	zeus_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardMatch
Namespace Prefix:	zeus_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

The maximum awards to each employee under the plan per period.

+ References

No definition available.

+ Details

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

- Definition

The minimum quantity of shares a participant is required to own to participate in compensation program.

+ References

No definition available.

+ Details

Name:	zeus_SharebasedCompensationArrangementBySharebasedPaymentAwardMinimumNumberOfSharesPerEmployee
Namespace Prefix:	zeus_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

The percentage of the participant's base salary that is used to determine the share-based compensation.

+ References

No definition available.

+ Details

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

- Definition

The amount of the remaining liabilities were reversed associated the modification of the plan.

+ References

No definition available.

+ Details

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

- Definition

The number of shares a participant is required to purchase on the open market in order to receive award.

+ References

No definition available.

+ Details

Name:	zeus_SharebasedCompensationArrangementBysharebasedpaymentawardmatchingpurchaserequirement
Namespace Prefix:	zeus_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Shares matched.

+ References

No definition available.

+ Details

Name:	zeus_SharesMatched
Namespace Prefix:	zeus_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_StatementEquityComponentsAxis=us-gaap_CommonStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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

- Details

Name:	us-gaap_PlanNameAxis=zeus_SeniorManagementCompensationProgramMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_AwardDateAxis=zeus_FiveYearAnniversaryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardDateAxis=zeus_TenYearAnniversaryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardDateAxis=zeus_FifteenYearAnniversaryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardDateAxis=zeus_TwentyFiveYearAnniversaryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardDateAxis=zeus_TwentyYearAnniversaryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PlanNameAxis=zeus_SeniorManagementStockIncentiveProgramMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Note 7 - Equity Plans (Details Textual) - USD ($)				6 Months Ended
Note 7 - Equity Plans (Details Textual) - USD ($)	Jul. 01, 2016	May 01, 2016	May 01, 2015	Jun. 30, 2016	Jun. 30, 2015
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant				1,000,000
Share Price		$ 22.62	$ 15.09
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		3,094	4,639
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		1 year
Match [Member] \| Senior Management Compensation Program [Member]
Shares Matched				2,500	7,750
Restricted Stock Units (RSUs) [Member] \| Senior Management Compensation Program [Member] \| Five Year Anniversary [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested				$ 25,000
Restricted Stock Units (RSUs) [Member] \| Senior Management Compensation Program [Member] \| Ten Year Anniversary [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested				50,000
Restricted Stock Units (RSUs) [Member] \| Senior Management Compensation Program [Member] \| Fifteen Year Anniversary [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested				75,000
Restricted Stock Units (RSUs) [Member] \| Senior Management Compensation Program [Member] \| Twenty Five Year Anniversary [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested				100,000
Restricted Stock Units (RSUs) [Member] \| Senior Management Compensation Program [Member] \| Twenty Year Anniversary [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested				100,000
Restricted Stock Units (RSUs) [Member] \| Senior Management Compensation Program [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Remaining Liability Reversed				$ 880,000
Restricted Stock Units (RSUs) [Member] \| Senior Management Stock Incentive Program [Member] \| Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	5 years
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Participant's Base Salary	10.00%
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Amount Per Employee	$ 17,500
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period				110,429
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested				$ 3,227,000
Senior Management Compensation Program [Member]
ShareBased Compensation Arrangement by ShareBased Payment Award Minimum Number of Shares Per Employee				750
Sharebased Compensation Arrangement bySharebasedPaymentAwardMatchingPurchaseRequirement				500
Sharebased Compensation Arrangement by Sharebased Payment Award Award Match				250
Restricted Stock Units Units Number Converted				0	2,437