Operating Segments - Schedule of Segment Reporting Information (Details) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2021	Mar. 31, 2020
Segment Reporting [Abstract]
Financed portion amount in the purchase of capital expenditure	$ 29	$ 82

Financed portion amount in the purchase of capital expenditure.

No definition available.

Name:	PESI_FinancedPortionAmountInPurchaseOfCapitalExpenditure
Namespace Prefix:	PESI_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant