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Capital Stock, Stock Plans and Stock-Based Compensation (Details Narrative) - USD ($) |  |  | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jul. 24, 2025 | Jan. 23, 2025 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024 | May 31, 2024
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |
Common stock, par value |  |  | $ 0.001 |  | $ 0.001 |
Proceeds from stock options exercised |  |  | $ 79,000 | $ 264,000 |  |
Warrant to purchase |  |  |  |  | 188,038 |
Warrants exercise price |  |  |  |  | $ 12.19 | $ 11.50
Employee Stock Options |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |
Stock options, exercise price |  |  | $ 11.59 | $ 9.43 |  |
Number of option exercised |  |  | 88,700 | 58,700 |  |
Common Stock [Member] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |
Number of shares issued from option exercise |  |  | 40,208 |  |  |
Number of option exercised |  |  | 67,000 |  |  |
Common Stock [Member] | Employee Stock Options |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |
Number of shares issued from option exercise |  |  | 21,700 |  |  |
Number of option exercised |  |  | 21,700 |  |  |
Proceeds from stock options exercised |  |  | $ 79,000 |  |  |
Common Stock [Member] | Minimum [Member] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |
Stock options, exercise price |  |  | $ 3.15 |  |  |
Common Stock [Member] | Minimum [Member] | Employee Stock Options |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |
Stock options, exercise price |  |  | 3.15 |  |  |
Common Stock [Member] | Maximum [Member] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |
Stock options, exercise price |  |  | 7.75 |  |  |
Common Stock [Member] | Maximum [Member] | Employee Stock Options |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |
Stock options, exercise price |  |  | $ 4.19 |  |  |
Employee and Directors [Member] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |
Unrecognized compensation cost related to unvested options consultant |  |  | $ 2,131,000 |  |  |
Weighted average term for unrecognized and unvested option to be recognized |  |  | 3 years |  |  |
2017 Stock Option Plan [Member] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |
Number of shares grants |  | 50,000 |  |  |  |
Vests period |  | 6 years |  |  |  |
Vests percentage |  | 20.00% |  |  |  |
Vests period |  | 5 years |  |  |  |
Stock options, exercise price |  | $ 10.70 |  |  |  |
2017 Stock Option Plan [Member] | Incentive Stock Option Agreement [Member] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |
Common stock, par value |  | $ 0.001 |  |  |  |
2003 Outside Directors Stock Option Plan [Member] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |
Number of shares grants | 10,000 |  |  |  |  |
Vests percentage | 25.00% |  |  |  |  |
Vests period | 4 years |  |  |  |  |
Stock options, exercise price | $ 12.23 |  |  |  |  |
2003 Outside Directors Stock Option Plan [Member] | Portion of Director Fee Earned in Common Stock [Member] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |
Allocated share-based compensation expense |  |  | $ 359,000 |  |  |
2003 Outside Directors Stock Option Plan [Member] | Common Stock [Member] |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |
Number of shares issued from option exercise |  |  | 38,256 |  |  |

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Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_TitleOfIndividualAxis=PESI_EmployeeAndDirectorsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PlanNameAxis=PESI_TwoThousandAndSeventeenStockOptionPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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- Details
Name: | us-gaap_PlanNameAxis=PESI_TwoThousandThreeOutsideDirectorsStockOptionPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_NatureOfExpenseAxis=PESI_PortionOfDirectorFeeEarnedInCommonStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |