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Note 9 - Discontinued Operations (Details) (USD $) | 3 Months Ended | 0 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2015 | Aug. 14, 2013 | Dec. 31, 2014
Note 9 - Discontinued Operations (Details) [Line Items] |  |  |
Number of Previously Shut Down Locations | 2 pesi_NumberOfPreviouslyShutDownLocations |  |
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment | $ 47,962,000 us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment |  | $ 47,123,000 us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
PFSG Facility Fire Damage [Member] | PFSG [Member] |  |  |
Note 9 - Discontinued Operations (Details) [Line Items] |  |  |
Maximum Deductible Amount in Insurance for General Liability |  | 300,000 pesi_MaximumDeductibleAmountInInsuranceForGeneralLiability / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = pesi_PFSGMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = pesi_PFSGFacilityFireDamageMember |
Assets Held-for-sale [Member] |  |  |
Note 9 - Discontinued Operations (Details) [Line Items] |  |  |
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment | 0 us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_MajorPropertyClassAxis = us-gaap_AssetsHeldForSaleMember |  | 0 us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_MajorPropertyClassAxis = us-gaap_AssetsHeldForSaleMember
Not Held For Sale [Member] |  |  |
Note 9 - Discontinued Operations (Details) [Line Items] |  |  |
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment | 10,000 us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_MajorPropertyClassAxis = pesi_NotHeldForSaleMember |  | 10,000 us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_MajorPropertyClassAxis = pesi_NotHeldForSaleMember
PFSG [Member] |  |  |
Note 9 - Discontinued Operations (Details) [Line Items] |  |  |
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, before Income Tax | (223,000)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodBeforeIncomeTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = pesi_PFSGMember |  | (266,000)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodBeforeIncomeTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = pesi_PFSGMember
Discontinued Operation, Tax Effect of Other Income (Loss) from Disposition of Discontinued Operation | 0 us-gaap_DiscontinuedOperationTaxEffectOfOtherIncomeLossFromDispositionOfDiscontinuedOperation / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = pesi_PFSGMember |  | 0 us-gaap_DiscontinuedOperationTaxEffectOfOtherIncomeLossFromDispositionOfDiscontinuedOperation / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = pesi_PFSGMember
Disposal Group, Including Discontinued Operation, Revenue | $ 0 us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = pesi_PFSGMember |  | $ 0 us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = pesi_PFSGMember

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- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 14 -Article 5 + Details
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