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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Nov. 30, 2014
Nov. 30, 2013
Cash flows from operating activities:    
Net income (loss) $ 2,134us-gaap_NetIncomeLoss $ 488us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operations:    
Depreciation and amortization 2,184us-gaap_DepreciationDepletionAndAmortization 3,291us-gaap_DepreciationDepletionAndAmortization
Stock-based compensation 504us-gaap_ShareBasedCompensation 249us-gaap_ShareBasedCompensation
Deferred income tax expense 645us-gaap_DeferredIncomeTaxExpenseBenefit 209us-gaap_DeferredIncomeTaxExpenseBenefit
Non-cash (gain) loss on hedging transactions (543)us-gaap_UnrealizedGainLossOnDerivativesAndCommodityContracts 122us-gaap_UnrealizedGainLossOnDerivativesAndCommodityContracts
Excess tax benefit from stock-based compensation (143)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities (152)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Non-cash change in asset retirement obligations (131)us-gaap_IncreaseDecreaseInAssetRetirementObligations  
Loss on operating leases 111us-gaap_GainLossOnSaleOfLeasedAssetsNetOperatingLeases  
Gain on sale of fixed assets (1)us-gaap_GainLossOnDispositionOfAssets  
Change in assets and liabilities:    
Trade accounts receivable, net (1,485)us-gaap_IncreaseDecreaseInAccountsReceivable 2,349us-gaap_IncreaseDecreaseInAccountsReceivable
Other receivables (325)us-gaap_IncreaseDecreaseInOtherReceivables (976)us-gaap_IncreaseDecreaseInOtherReceivables
Inventories 215us-gaap_IncreaseDecreaseInInventories 1,150us-gaap_IncreaseDecreaseInInventories
Prepaid expenses 885us-gaap_IncreaseDecreaseInPrepaidExpense 335us-gaap_IncreaseDecreaseInPrepaidExpense
Tenant allowance reimbursement 182penx_IncreaseDecreaseInTenantAllowanceReimbursement  
(Increase) decrease in margin accounts 2,950us-gaap_IncreaseDecreaseInMarginDepositsOutstanding 846us-gaap_IncreaseDecreaseInMarginDepositsOutstanding
Accounts payable and accrued liabilities 813us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities 855us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Taxes payable 550penx_IncreaseDecreaseInTaxesPayable 100penx_IncreaseDecreaseInTaxesPayable
Pension and other postretirement benefit contributions (267)us-gaap_PensionAndOtherPostretirementBenefitContributions (724)us-gaap_PensionAndOtherPostretirementBenefitContributions
Pension and other postretirement benefit costs 272us-gaap_PensionAndOtherPostretirementBenefitExpense 761us-gaap_PensionAndOtherPostretirementBenefitExpense
Other (462)us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet (229)us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
Net cash flow provided by operating activities 8,088us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 8,674us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash flows from investing activities:    
Acquisitions of property, plant and equipment, net (2,849)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (2,047)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Acquisition of Gum Technology, net (375)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired  
Other 8us-gaap_PaymentsForProceedsFromOtherInvestingActivities (272)us-gaap_PaymentsForProceedsFromOtherInvestingActivities
Net cash used in investing activities (3,216)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (2,319)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Cash flows from financing activities:    
Proceeds from revolving line of credit 6,100us-gaap_ProceedsFromLongTermLinesOfCredit  
Payments on revolving line of credit (8,100)us-gaap_RepaymentsOfLongTermLinesOfCredit (3,500)us-gaap_RepaymentsOfLongTermLinesOfCredit
Payments of long-term debt   (50)us-gaap_RepaymentsOfOtherLongTermDebt
Payment of loan fees (147)us-gaap_PaymentsOfLoanCosts  
Payments under capital lease obligations (45)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations (39)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations
Payments on financing arrangements (551)us-gaap_RepaymentsOfShortTermDebt (549)us-gaap_RepaymentsOfShortTermDebt
Excess tax benefit from stock-based compensation 143us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 152us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Exercise of stock options 677us-gaap_ProceedsFromStockOptionsExercised  
Increase (decrease) in cash overdraft (2,828)us-gaap_ProceedsFromRepaymentsOfBankOverdrafts (2,393)us-gaap_ProceedsFromRepaymentsOfBankOverdrafts
Net cash provided by (used in) financing activities (4,751)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (6,379)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Increase (decrease) in cash and cash equivalents 121us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (24)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents, beginning of period 189us-gaap_CashAndCashEquivalentsAtCarryingValue 221us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents, end of period $ 310us-gaap_CashAndCashEquivalentsAtCarryingValue $ 197us-gaap_CashAndCashEquivalentsAtCarryingValue