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Subsequent Events (Details Narrative) - Subsequent Event [Member] - Amendment to the Revised Loan Agreement [Member] $ in Thousands | Jul. 26, 2018 USD ($)
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Line of credit facility, borrowing restriction released | $ 1,000
Indefinite reduction of borrowing availability | 2,000
Working capital from additional availability | 1,000
Term Loan Agreement [Member] |
Indefinite reduction of borrowing availability | $ 2,000

X
- Definition Indefinite reduction of borrowing availability. + References No definition available. + Details
Name: | PESI_IndefiniteReductionOfBorrowingAvailability
Namespace Prefix: | PESI_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Borrowing availability restriction previously imposed by lender which was released by lender.. + References No definition available. + Details
Name: | PESI_LineOfCreditFacilityBorrowingRestrictionReleased
Namespace Prefix: | PESI_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Working capital resulting from release of borrowing restriction by lender. + References No definition available. + Details
Name: | PESI_WorkingCapitalFromAdditionalAvailability
Namespace Prefix: | PESI_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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_AmendmentToTheRevisedLoanAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TypeOfArrangementAxis=PESI_TermLoanAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |