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Note 12 - Subsequent Events (Details Textual) - Subsequent Event [Member] - USD ($) | Aug. 02, 2016 | Aug. 22, 2016 | Aug. 21, 2016
--- | --- | --- | ---
Revised Loan Agreement [Member] | PNC Bank [Member] |  |  |
Debt Instrument, Covenant Compliance, Minimum Tangible Adjusted Net Worth |  | $ 26,000,000 | $ 30,000,000
Lenders [Member] |  |  |
Class of Warrant or Right, Exercised During Period | 35,000 |  |
Proceeds from Warrant Exercises | $ 156,000 |  |

X
- Definition The number of warrants or rights exercised during period. + References No definition available. + Details
Name: | pesi_ClassOfWarrantOrRightExercisedDuringPeriod
Namespace Prefix: | pesi_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the debt covenvant of minimum tangible adjusted net worth of the credit agreement. + References No definition available. + Details
Name: | pesi_DebtInstrumentCovenantComplianceMinimumTangibleAdjustedNetWorth
Namespace Prefix: | pesi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The cash inflow associated with the amount received from holders exercising their stock warrants. + References No definition available. + Details
Name: | us-gaap_ProceedsFromWarrantExercises
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

X
- Details
Name: | us-gaap_DebtInstrumentAxis=pesi_RevisedLoanAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LineOfCreditFacilityAxis=pesi_PNCBankMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=pesi_LendersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |