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Note 7 - Debt (Details) (USD $)
12 Months Ended 1 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jul. 31, 2011
Apr. 01, 2014
Jun. 30, 2013
Jun. 30, 2012
Note 7 - Debt (Details) [Line Items]              
Prepaid Expense and Other Assets, Current $ 20,434,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent $ 12,786,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent          
Derivative, Fixed Interest Rate 1.21%us-gaap_DerivativeFixedInterestRate            
Debt Instrument, Interest Rate, Effective Percentage 2.40%us-gaap_DebtInstrumentInterestRateEffectivePercentage 2.30%us-gaap_DebtInstrumentInterestRateEffectivePercentage 2.70%us-gaap_DebtInstrumentInterestRateEffectivePercentage        
Effect of Swap Interest Rate Agreement 3.46%zeus_EffectOfSwapInterestRateAgreement            
Interest Paid 5,793,000us-gaap_InterestPaid 5,537,000us-gaap_InterestPaid 7,295,000us-gaap_InterestPaid        
Long-term Debt, Gross 234,700,000us-gaap_DebtInstrumentCarryingAmount 219,200,000us-gaap_DebtInstrumentCarryingAmount 254,200,000us-gaap_DebtInstrumentCarryingAmount        
Availability Dollar Amount [Member] | Asset-Based Revolving Credit Facility Due June 30, 2019 [Member] | ABL Credit Facility [Member]              
Note 7 - Debt (Details) [Line Items]              
Line of Credit Facility Covenant Terms Monetary 30,000,000zeus_LineOfCreditFacilityCovenantTermsMonetary
/ us-gaap_CreditFacilityAxis
= zeus_AssetBasedRevolvingCreditFacilityDueJune302019Member
/ us-gaap_LineOfCreditFacilityAxis
= zeus_ABLCreditFacilityMember
/ us-gaap_StatementScenarioAxis
= zeus_AvailabilityDollarAmountMember
           
Term Loan [Member] | London Interbank Offered Rate (LIBOR) [Member] | ABL Credit Facility [Member]              
Note 7 - Debt (Details) [Line Items]              
Long-term Line of Credit 40,100,000us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= zeus_TermLoanMember
/ us-gaap_LineOfCreditFacilityAxis
= zeus_ABLCreditFacilityMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
        53,200,000us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= zeus_TermLoanMember
/ us-gaap_LineOfCreditFacilityAxis
= zeus_ABLCreditFacilityMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
53,200,000us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= zeus_TermLoanMember
/ us-gaap_LineOfCreditFacilityAxis
= zeus_ABLCreditFacilityMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
Industrial Revenue Bond [Member] | Chicago Tube and Iron Company Acquisition [Member]              
Note 7 - Debt (Details) [Line Items]              
Business Combination, Consideration Transferred, Liabilities Incurred       5,900,000us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred
/ us-gaap_BusinessAcquisitionAxis
= zeus_ChicagoTubeAndIronCompanyAcquisitionMember
/ us-gaap_DebtInstrumentAxis
= zeus_IndustrialRevenueBondMember
     
Debt Instrument, Interest Rate, Effective Percentage 0.16%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_BusinessAcquisitionAxis
= zeus_ChicagoTubeAndIronCompanyAcquisitionMember
/ us-gaap_DebtInstrumentAxis
= zeus_IndustrialRevenueBondMember
           
Term Loan [Member] | London Interbank Offered Rate (LIBOR) [Member] | ABL Credit Facility [Member]              
Note 7 - Debt (Details) [Line Items]              
Long-term Line of Credit             53,200,000us-gaap_LineOfCredit
/ us-gaap_LineOfCreditFacilityAxis
= zeus_ABLCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= zeus_TermLoanMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
Term Loan [Member] | ABL Credit Facility [Member]              
Note 7 - Debt (Details) [Line Items]              
Other Long-term Debt 44,500,000us-gaap_OtherLongTermDebt
/ us-gaap_LineOfCreditFacilityAxis
= zeus_ABLCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= zeus_TermLoanMember
           
Interest Rate Swap [Member]              
Note 7 - Debt (Details) [Line Items]              
Long-term Line of Credit 40,100,000us-gaap_LineOfCredit
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
           
Fixed Rate Interest Hedge, Notional Monthly Decrease 729,000zeus_FixedRateInterestHedgeNotionalMonthlyDecrease
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
           
Asset-Based Revolving Credit Facility Due June 30, 2016 [Member] | ABL Credit Facility [Member]              
Note 7 - Debt (Details) [Line Items]              
Line of Credit Facility, Maximum Borrowing Capacity 315,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= zeus_AssetBasedRevolvingCreditFacilityDueJune302016Member
/ us-gaap_LineOfCreditFacilityAxis
= zeus_ABLCreditFacilityMember
           
Asset-Based Revolving Credit Facility Due June 30, 2019 [Member] | Base Rate [Member] | Minimum [Member] | ABL Credit Facility [Member]              
Note 7 - Debt (Details) [Line Items]              
Debt Instrument, Basis Spread on Variable Rate 0.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= zeus_AssetBasedRevolvingCreditFacilityDueJune302019Member
/ us-gaap_LineOfCreditFacilityAxis
= zeus_ABLCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember
           
Asset-Based Revolving Credit Facility Due June 30, 2019 [Member] | Base Rate [Member] | Maximum [Member] | ABL Credit Facility [Member]              
Note 7 - Debt (Details) [Line Items]              
Debt Instrument, Basis Spread on Variable Rate 0.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= zeus_AssetBasedRevolvingCreditFacilityDueJune302019Member
/ us-gaap_LineOfCreditFacilityAxis
= zeus_ABLCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember
           
Asset-Based Revolving Credit Facility Due June 30, 2019 [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] | ABL Credit Facility [Member]              
Note 7 - Debt (Details) [Line Items]              
Debt Instrument, Basis Spread on Variable Rate 1.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= zeus_AssetBasedRevolvingCreditFacilityDueJune302019Member
/ us-gaap_LineOfCreditFacilityAxis
= zeus_ABLCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
           
Asset-Based Revolving Credit Facility Due June 30, 2019 [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] | ABL Credit Facility [Member]              
Note 7 - Debt (Details) [Line Items]              
Debt Instrument, Basis Spread on Variable Rate 3.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= zeus_AssetBasedRevolvingCreditFacilityDueJune302019Member
/ us-gaap_LineOfCreditFacilityAxis
= zeus_ABLCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
           
Asset-Based Revolving Credit Facility Due June 30, 2019 [Member] | ABL Credit Facility [Member]              
Note 7 - Debt (Details) [Line Items]              
Line of Credit Facility, Maximum Borrowing Capacity 365,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= zeus_AssetBasedRevolvingCreditFacilityDueJune302019Member
/ us-gaap_LineOfCreditFacilityAxis
= zeus_ABLCreditFacilityMember
           
Line of Credit Facility, Current Borrowing Capacity 365,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= zeus_AssetBasedRevolvingCreditFacilityDueJune302019Member
/ us-gaap_LineOfCreditFacilityAxis
= zeus_ABLCreditFacilityMember
           
Line of Credit Facility, Covenant Terms, Percentage of Revolver Commitments 10.00%zeus_LineOfCreditFacilityCovenantTermsPercentageofRevolverCommitments
/ us-gaap_CreditFacilityAxis
= zeus_AssetBasedRevolvingCreditFacilityDueJune302019Member
/ us-gaap_LineOfCreditFacilityAxis
= zeus_ABLCreditFacilityMember
           
Balance Required for Compliance with Revolver Commitments 36,500,000zeus_BalanceRequiredForComplianceWithRevolverCommitments
/ us-gaap_CreditFacilityAxis
= zeus_AssetBasedRevolvingCreditFacilityDueJune302019Member
/ us-gaap_LineOfCreditFacilityAxis
= zeus_ABLCreditFacilityMember
           
Amortized Banking Fees [Member] | ABL Credit Facility [Member]              
Note 7 - Debt (Details) [Line Items]              
Prepaid Expense and Other Assets, Current 1,200,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent
/ us-gaap_FairValueByAssetClassAxis
= zeus_AmortizedBankingFeesMember
/ us-gaap_LineOfCreditFacilityAxis
= zeus_ABLCreditFacilityMember
           
Amortized Banking Fees [Member]              
Note 7 - Debt (Details) [Line Items]              
Prepaid Expense and Other Assets, Current 3,500,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent
/ us-gaap_FairValueByAssetClassAxis
= zeus_AmortizedBankingFeesMember
           
Minimum [Member]              
Note 7 - Debt (Details) [Line Items]              
Derivative Premium Rate 1.75%zeus_DerivativePremiumRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
           
Maximum [Member]              
Note 7 - Debt (Details) [Line Items]              
Derivative Premium Rate 2.25%zeus_DerivativePremiumRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
           
ABL Credit Facility [Member]              
Note 7 - Debt (Details) [Line Items]              
Line of Credit Facility, Remaining Borrowing Capacity 98,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= zeus_ABLCreditFacilityMember
           
Debt Instrument, Periodic Payment, Principal         $ 810,000us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ us-gaap_LineOfCreditFacilityAxis
= zeus_ABLCreditFacilityMember
   
Asset-Based Revolving Credit Facility Due June 30, 2019 [Member]              
Note 7 - Debt (Details) [Line Items]              
Line of Credit Facility Covenant Terms EBITDA Ratio 1.00zeus_LineOfCreditFacilityCovenantTermsEBITDARatio
/ us-gaap_LineOfCreditFacilityAxis
= zeus_AssetBasedRevolvingCreditFacilityDueJune302019Member