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v3.21.1

Commitments and Contingencies (Details Narrative) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Jun. 30, 2003 | Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Self-insured retention |  | $ 100,000 |  |
Finite risk sinking fund (restricted cash) |  | 11,464 |  | $ 11,446
Interest earned on sinking fund |  | 1,993 |  |
Interest income, other |  | 18 | $ 56 |
Letters of credit outstanding, amount |  | 3,026 |  |
Bond outstanding |  | 42,973 |  |
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 |  | 19,897 |  |
Finite risk sinking fund (restricted cash) |  | 11,464 |  | 11,446
Interest earned on sinking fund |  |  |  | $ 1,975
Interest income, other |  | $ 18 | $ 56 |
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 Amount of cash and cash equivalents restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + 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: | dtr-types: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 Self-insured retention. + References No definition available. + Details
Name: | PESI_SelfinsuredRetention
Namespace Prefix: | PESI_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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: |