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Commitments and Contingencies (Details Narrative) - USD ($) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 22, 2019 | Jun. 30, 2003 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Finite risk sinking fund (restricted cash) - current |  |  | $ 5,000 |  | $ 5,000 |  |
Interest income, other |  |  | 107 | $ 81 | 188 | $ 130 |
Letters of credit outstanding, amount |  |  | 2,639 |  | 2,639 |  |
Bond outstanding |  |  | 29,465 |  | 29,465 |  |
Subsequent Event [Member] |  |  |  |  |  |  |
Maximum allowable coverage of insurance policy | $ 28,177 |  |  |  |  |  |
Sinking funds received | $ 5,000 |  |  |  |  |  |
Sinking funds description | On July 22, 2019, the Company received $5,000,000 of the sinking funds. Accordingly, at June 30, 2019, the Company reclassified $5,000,000 of the $16,159,000 in sinking funds initially included in other long term assets on the accompanying Consolidated Balance Sheets to sinking funds (restricted cash) included in current assets on the accompanying Consolidated Balance Sheets (See "Note 14 – Subsequent Events - 2003 Closure Policy" for a discussion of the release of the sinking funds by AIG and certain amendment made to the 2003 Closure Policy). |  |  |  |  |  |
American International Group, Inc [Member] |  |  |  |  |  |  |
Period of finite risk insurance policy |  | 25 years |  |  |  |  |
Maximum allowable coverage of insurance policy |  |  | 39,000 |  | 39,000 |  |
Financial assurance coverage amount under insurance policy |  |  | 30,549 |  | 30,549 |  |
Sinking fund related to insurance policy |  |  | 16,159 |  | 16,159 |  | 15,971
Interest earned on sinking fund |  |  | 1,688 |  | 1,688 |  | $ 1,500
Interest income, other |  |  | $ 107 | $ 81 | $ 188 | $ 131 |
Insurers obligation to entity on termination of contract |  |  | 100.00% |  | 100.00% |  |

X
- Definition The total amount of the bonds outstanding as of the reporting date. + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Represents the financial assurance coverage amount under insurance policy. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition As of the balance sheet date, the current portion of total amount into the sinking fund, along with interest income earned, in connection for the company's closure policies. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Insurer's obligation to entity on termination of contract in terms of percentage of sinking fund. + References No definition available. + Details
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Period Type: | instant

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Balance Type: | credit
Period Type: | instant

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- Definition Maximum allowable coverage of insurance policy against annual inflation and other performance and surety bond requirements. + References No definition available. + Details
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- Definition Represents the period of finite risk insurance policy. + References No definition available. + Details
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Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Sinking funds received. + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

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- Definition Represents the sinking fund related to the insurance policy. + References No definition available. + Details
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Namespace Prefix: | PESI_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Sinking funds description. + References No definition available. + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Details
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Period Type: |