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v3.20.1

Commitments and Contingencies (Details Narrative) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Jun. 30, 2003 | Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Finite risk sinking fund (restricted cash) |  | $ 11,363 |  | $ 11,307
Interest income, other |  | 56 | $ 81 |
Letters of credit outstanding, amount |  | 3,139 |  |
Bond outstanding |  | 51,538 |  |
American International Group, Inc [Member] |  |  |  |
Period of finite risk insurance policy | 25 years |  |  |
Maximum allowable coverage of insurance policy | $ 28,177 |  |  |
Coverage amount under the policy |  | 19,651 |  |
Interest earned on sinking fund |  | 1,892 |  | $ 1,836
Interest income, other |  | $ 56 | $ 81 |
Insurers obligation to entity on termination of contract |  | 100.00% |  |

X
- Definition The total amount of the bonds outstanding as of the reporting date. + References No definition available. + Details
Name: | PESI_BondOutstanding
Namespace Prefix: | PESI_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Coverage amount under the policy. + References No definition available. + Details
Name: | PESI_CoverageAmountUnderPolicy
Namespace Prefix: | PESI_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition As of the balance sheet date, the total amount into the sinking fund, along with interest income earned, in connection for the company's closure policies. + References No definition available. + Details
Name: | PESI_FiniteRiskSinkingFund
Namespace Prefix: | PESI_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Insurer's obligation to entity on termination of contract in terms of percentage of sinking fund. + References No definition available. + Details
Name: | PESI_InsurersObligationToEntityOnTerminationOfContract
Namespace Prefix: | PESI_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the interest earned on sinking fund. + References No definition available. + Details
Name: | PESI_InterestEarnedOnSinkingFund
Namespace Prefix: | PESI_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Maximum allowable coverage of insurance policy against annual inflation and other performance and surety bond requirements. + References No definition available. + Details
Name: | PESI_MaximumAllowableCoverageOfInsurancePolicy
Namespace Prefix: | PESI_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the period of finite risk insurance policy. + References No definition available. + Details
Name: | PESI_PeriodOfFiniteRiskInsurancePolicy
Namespace Prefix: | PESI_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of interest income earned from interest bearing assets classified as other. + References No definition available. + Details
Name: | us-gaap_InterestIncomeOther
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | srt_CounterpartyNameAxis=PESI_AmericanInternationalGroupIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |