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Note 11 - Equity Plans (Details) (USD $)	0 Months Ended	12 Months Ended			0 Months Ended		1 Months Ended	9 Months Ended
	Jan. 03, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Mar. 01, 2014	Jan. 02, 2013	Dec. 31, 2013	Sep. 30, 2014	Dec. 31, 2011
Note 11 - Equity Plans (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period		7,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised	11,667us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised	4,168us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value (in Dollars)		$ 103,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	$ 218,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	$ 56,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
Proceeds from Stock Options Exercised (in Dollars)		86,000us-gaap_ProceedsFromStockOptionsExercised	86,000us-gaap_ProceedsFromStockOptionsExercised	34,000us-gaap_ProceedsFromStockOptionsExercised
Deferred Tax Expense from Stock Options Exercised (in Dollars)		40,000us-gaap_DeferredTaxExpenseFromStockOptionsExercised	83,000us-gaap_DeferredTaxExpenseFromStockOptionsExercised	21,000us-gaap_DeferredTaxExpenseFromStockOptionsExercised
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	1,800us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Share-based Compensation Arrangement by Share-based Payment Award, Minimum Number of Shares Per Employee		750zeus_ShareBasedCompensationArrangementByShareBasedPaymentAwardMinimumNumberOfSharesPerEmployee
Share-based Compensation Arrangement by Share-based Payment Award, Matching Purchase Requirement		500zeus_SharebasedCompensationArrangementbySharebasedPaymentAwardMatchingPurchaseRequirement
Share-based Compensation Arrangement by Share-based Payment Award, Award Match		250zeus_SharebasedCompensationArrangementbySharebasedPaymentAwardAwardMatch
Restricted Stock Units Units Number Converted			0zeus_RestrictedStockUnitsUnitsNumberConverted
Common Stock [Member]
Note 11 - Equity Plans (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant								500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Share Price (in Dollars per share)	25.55us-gaap_SharePrice / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember				27.51us-gaap_SharePrice / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	23.41us-gaap_SharePrice / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember			$ 23.32us-gaap_SharePrice / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Stock Issued During Period, Shares, Employee Stock Purchase Plans		7,000us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	12,000us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	36,000us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Restricted Stock Units (RSUs) [Member] | Five Year Anniversary [Member]
Note 11 - Equity Plans (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested (in Dollars)		25,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested / us-gaap_AwardDateAxis = zeus_FiveYearAnniversaryMember / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember
Restricted Stock Units (RSUs) [Member] | Ten Year Anniversary [Member]
Note 11 - Equity Plans (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested (in Dollars)		50,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested / us-gaap_AwardDateAxis = zeus_TenYearAnniversaryMember / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember
Restricted Stock Units (RSUs) [Member] | Fifteen Year Anniversary [Member]
Note 11 - Equity Plans (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested (in Dollars)		75,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested / us-gaap_AwardDateAxis = zeus_FifteenYearAnniversaryMember / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember
Restricted Stock Units (RSUs) [Member] | Twenty Year Anniversary [Member]
Note 11 - Equity Plans (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested (in Dollars)		100,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested / us-gaap_AwardDateAxis = zeus_TwentyYearAnniversaryMember / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember
Restricted Stock Units (RSUs) [Member] | Twenty Five Year Anniversary [Member]
Note 11 - Equity Plans (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested (in Dollars)		100,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested / us-gaap_AwardDateAxis = zeus_TwentyFiveYearAnniversaryMember / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember
Restricted Stock Units (RSUs) [Member] | Supplemental Employee Retirement Plan [Member]
Note 11 - Equity Plans (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		21,506us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember	28,341us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember	31,243us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember
Restricted Stock Units (RSUs) [Member]
Note 11 - Equity Plans (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		35,939us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember			2,544us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember	1,800us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember	81,475us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period							5 years	1 year
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested (in Dollars)		3,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember
Share-based Compensation Arrangement by Share-based Payment Award Equity Instruments Other than Options Converted into Shares Intrinsic Value (in Dollars)		$ 0zeus_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsConvertedIntoSharesIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember		$ 0zeus_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsConvertedIntoSharesIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember
Match [Member]
Note 11 - Equity Plans (Details) [Line Items]
Shares Matched		9,875zeus_SharesMatched / us-gaap_AwardTypeAxis = zeus_MatchMember	8,500zeus_SharesMatched / us-gaap_AwardTypeAxis = zeus_MatchMember
Stock Issued During Period, Shares, Employee Stock Purchase Plans				7,250us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans / us-gaap_AwardTypeAxis = zeus_MatchMember

X

- Definition

Amount of deferred tax expense from write-off of the deferred tax asset related to deductible stock options at exercise.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 20

-Section 55

-Paragraph 20

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X

- Definition

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

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X

- Definition

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.

+ References

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X

- Definition

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

+ References

No definition available.

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X

- 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

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X

- 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

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- Definition

Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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- Definition

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

+ References

No definition available.

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- Definition

Number of shares issued during the period as a result of an employee stock purchase plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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- Definition

Number of share options (or share units) exercised during the current period.

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- Definition

Restricted Stock Units converted to shares.

+ References

No definition available.

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- Definition

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

+ References

No definition available.

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- Definition

The intrinsic value of equity instruments other than options which were converted into shares during the period.

+ References

No definition available.

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

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- Definition

The number of shares matched by the company during the period.

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