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Accrued Expenses (Details Narrative) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($)
Executive Officers [Member] |
Compensation expenses | $ 270

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- Definition Amount of expense for salary and wage arising from service rendered by officer. Excludes allocated cost, labor-related nonsalary expense, and direct and overhead labor cost included in cost of good and service sold. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(4)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
Name: | us-gaap_OfficersCompensation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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