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Note 6 - Long Term Debt (Details) (USD $) | 0 Months Ended | 12 Months Ended | 0 Months Ended | 3 Months Ended | 0 Months Ended | 1 Months Ended
--- | --- | --- | --- | --- | --- | ---
Aug. 02, 2013 | Dec. 31, 2014 | Oct. 31, 2011 | Jul. 28, 2014 | Mar. 31, 2015 | Feb. 12, 2013 | Jan. 31, 2015
Note 6 - Long Term Debt (Details) [Line Items] |  |  |  |  |  |  |
Long-term Debt |  | 11,372,000 us-gaap_LongTermDebt |  |  | $ 11,977,000 us-gaap_LongTermDebt |  |
Share Price (in Dollars per share) | $ 2.23 us-gaap_SharePrice |  |  |  |  |  |
Lenders [Member] | Promissory Note dated August 2, 2013 [Member] |  |  |  |  |  |  |
Note 6 - Long Term Debt (Details) [Line Items] |  |  |  |  |  |  |
Proceeds from Issuance of Long-term Debt | 3,000,000 us-gaap_ProceedsFromIssuanceOfLongTermDebt / us-gaap_LongtermDebtTypeAxis = pesi_PromissoryNoteDatedAugustSecond2013Member / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = pesi_LendersMember |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in Shares) | 35,000 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight / us-gaap_LongtermDebtTypeAxis = pesi_PromissoryNoteDatedAugustSecond2013Member / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = pesi_LendersMember |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per share) | $ 2.23 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_LongtermDebtTypeAxis = pesi_PromissoryNoteDatedAugustSecond2013Member / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = pesi_LendersMember |  |  |  |  |  |
Warrants Exercisable Term | 6 months |  |  |  |  |  |
Warrants Not Settleable in Cash, Fair Value Disclosure | 59,000 us-gaap_WarrantsNotSettleableInCashFairValueDisclosure / us-gaap_LongtermDebtTypeAxis = pesi_PromissoryNoteDatedAugustSecond2013Member / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = pesi_LendersMember |  |  |  |  |  |
Stock Issued During Period, Shares, Other (in Shares) | 90,000 us-gaap_StockIssuedDuringPeriodSharesOther / us-gaap_LongtermDebtTypeAxis = pesi_PromissoryNoteDatedAugustSecond2013Member / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = pesi_LendersMember |  |  |  |  |  |
Number of Shares Received by each Lender (in Shares) | 45,000 pesi_NumberOfSharesReceivedByEachLender / us-gaap_LongtermDebtTypeAxis = pesi_PromissoryNoteDatedAugustSecond2013Member / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = pesi_LendersMember |  |  |  |  |  |
Stock Issued During Period, Value, Other | 200,000 us-gaap_StockIssuedDuringPeriodValueOther / us-gaap_LongtermDebtTypeAxis = pesi_PromissoryNoteDatedAugustSecond2013Member / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = pesi_LendersMember |  |  |  |  |  |
Maximum Number of Payoffs of Shares in Terms of Outstanding Equity |  | 20.00%pesi_MaximumNumberOfPayoffsOfSharesInTermsOfOutstandingEquity / us-gaap_LongtermDebtTypeAxis = pesi_PromissoryNoteDatedAugustSecond2013Member / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = pesi_LendersMember |  |  |  |  |
Amended Loan Agreement [Member] | Revolving Credit Facility [Member] | PNC Bank [Member] |  |  |  |  |  |  |
Note 6 - Long Term Debt (Details) [Line Items] |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | 12,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_DebtInstrumentAxis = pesi_AmendedLoanAgreementMember / us-gaap_LineOfCreditFacilityAxis = pesi_PNCBankMember |  |  |  |
Amendment 4 [Member] | Term Loan [Member] | PNC Bank [Member] |  |  |  |  |  |  |
Note 6 - Long Term Debt (Details) [Line Items] |  |  |  |  |  |  |
Long-term Debt |  |  | 16,000,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = pesi_Amendment4Member / us-gaap_LineOfCreditFacilityAxis = pesi_PNCBankMember / us-gaap_LongtermDebtTypeAxis = pesi_TermLoanMember |  |  |  |
Debt Instrument, Periodic Payment, Principal |  |  | 190,000 us-gaap_DebtInstrumentPeriodicPaymentPrincipal / us-gaap_DebtInstrumentAxis = pesi_Amendment4Member / us-gaap_LineOfCreditFacilityAxis = pesi_PNCBankMember / us-gaap_LongtermDebtTypeAxis = pesi_TermLoanMember |  |  |  |
Debt Instrument, Term |  |  | 7 years |  |  |  |
Amendment 6 [Member] | PFSG [Member] | PNC Bank [Member] |  |  |  |  |  |  |
Note 6 - Long Term Debt (Details) [Line Items] |  |  |  |  |  |  |
Line of Credit Facility Reduction |  |  |  | 1,500,000 pesi_LineOfCreditFacilityReduction / us-gaap_DebtInstrumentAxis = pesi_Amendment6Member / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = pesi_PFSGMember / us-gaap_LineOfCreditFacilityAxis = pesi_PNCBankMember |  |  |
Proceeds from Insurance Settlement, Investing Activities |  |  |  | 3,850,000 us-gaap_ProceedsFromInsuranceSettlementInvestingActivities / us-gaap_DebtInstrumentAxis = pesi_Amendment6Member / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = pesi_PFSGMember / us-gaap_LineOfCreditFacilityAxis = pesi_PNCBankMember |  |  |
Amendment 6 [Member] | PNC Bank [Member] |  |  |  |  |  |  |
Note 6 - Long Term Debt (Details) [Line Items] |  |  |  |  |  |  |
Line of Credit Facility Reduction |  |  |  |  | 1,500,000 pesi_LineOfCreditFacilityReduction / us-gaap_DebtInstrumentAxis = pesi_Amendment6Member / us-gaap_LineOfCreditFacilityAxis = pesi_PNCBankMember |  |
Promissory Notes and Installment Agreements [Member] | TNC [Member] |  |  |  |  |  |  |
Note 6 - Long Term Debt (Details) [Line Items] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  | 230,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = pesi_PromissoryNotesAndInstallmentAgreementsMember / us-gaap_LineOfCreditFacilityAxis = pesi_TNCMember |
Prinicipal Balance of Promissory Note Cancelled as Part of Legal Settlement Arising from Business Acquisition |  |  |  |  |  | 1,460,000 pesi_PrinicipalBalanceOfPromissoryNoteCancelledAsPartOfLegalSettlementArisingFromBusinessAcquisition / us-gaap_DebtInstrumentAxis = pesi_PromissoryNotesAndInstallmentAgreementsMember / us-gaap_LineOfCreditFacilityAxis = pesi_TNCMember |
Repayments of Unsecured Debt |  |  |  |  |  |  | 10,000 us-gaap_RepaymentsOfUnsecuredDebt / us-gaap_DebtInstrumentAxis = pesi_PromissoryNotesAndInstallmentAgreementsMember / us-gaap_LineOfCreditFacilityAxis = pesi_TNCMember
Promissory Note dated August 2, 2013 [Member] |  |  |  |  |  |  |
Note 6 - Long Term Debt (Details) [Line Items] |  |  |  |  |  |  |
Debt Instrument, Unamortized Discount |  | 137,000 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_LongtermDebtTypeAxis = pesi_PromissoryNoteDatedAugustSecond2013Member |  |  | 115,000 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_LongtermDebtTypeAxis = pesi_PromissoryNoteDatedAugustSecond2013Member |  |
Revolving Credit Facility [Member] | PNC Bank [Member] |  |  |  |  |  |  |
Note 6 - Long Term Debt (Details) [Line Items] |  |  |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  |  |  |  | $ 3,023,000 us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LineOfCreditFacilityAxis = pesi_PNCBankMember |  |

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