Annual report pursuant to Section 13 and 15(d)

Note 5 - Goodwill and Other Intangible Assets (Details) - Changes in the Carrying Amount Goodwill by Reporting Segments

v2.4.1.9
Note 5 - Goodwill and Other Intangible Assets (Details) - Changes in the Carrying Amount Goodwill by Reporting Segments (USD $)
12 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Oct. 01, 2014
Oct. 01, 2013
Goodwill [Line Items]        
Balance $ 1,330,000us-gaap_Goodwill $ 29,186,000us-gaap_Goodwill    
Goodwill impairment (380,000)us-gaap_GoodwillImpairmentLoss (27,856,000)us-gaap_GoodwillImpairmentLoss    
Balance 0us-gaap_Goodwill 1,330,000us-gaap_Goodwill    
Treatment [Member]        
Goodwill [Line Items]        
Balance   13,691,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= pesi_TreatmentMember
   
Goodwill impairment   (13,691,000)us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= pesi_TreatmentMember
0us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= pesi_TreatmentMember
0us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= pesi_TreatmentMember
Services [Member] | SYA [Member]        
Goodwill [Line Items]        
Sale of SYA subsidary (950,000)us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= pesi_SYAMember
/ us-gaap_StatementBusinessSegmentsAxis
= pesi_ServicesMember
     
Services [Member]        
Goodwill [Line Items]        
Balance 1,330,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= pesi_ServicesMember
15,495,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= pesi_ServicesMember
   
Goodwill impairment (380,000)us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= pesi_ServicesMember
(14,165,000)us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= pesi_ServicesMember
   
Balance   1,330,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= pesi_ServicesMember
   
SYA [Member]        
Goodwill [Line Items]        
Sale of SYA subsidary $ (950,000)us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= pesi_SYAMember