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Note 6 - Long Term Debt (Details) - Long-term Debt Instruments (Parentheticals) (USD $) | 3 Months Ended
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Mar. 31, 2015
Debt Instrument [Line Items] |
Effective interest rate | 6.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage
Revolving Credit [Member] | Prime Rate [Member] |
Debt Instrument [Line Items] |
Reference rate | 3.25%pesi_ReferenceRate / us-gaap_DebtInstrumentAxis = pesi_RevolvingCreditMember / us-gaap_VariableRateAxis = us-gaap_PrimeRateMember
Revolving Credit [Member] | London Interbank Offered Rate (LIBOR) [Member] |
Debt Instrument [Line Items] |
Basis spread on variable rate | 2.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = pesi_RevolvingCreditMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember
Revolving Credit [Member] |
Debt Instrument [Line Items] |
Basis spread on variable rate | 3.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = pesi_RevolvingCreditMember
Effective interest rate | 3.80%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = pesi_RevolvingCreditMember
Term Loan [Member] | Prime Rate [Member] |
Debt Instrument [Line Items] |
Periodic payment, principal (in Dollars) | 190,000 us-gaap_DebtInstrumentPeriodicPaymentPrincipal / us-gaap_DebtInstrumentAxis = pesi_TermLoanMember / us-gaap_VariableRateAxis = us-gaap_PrimeRateMember
Term Loan [Member] | London Interbank Offered Rate (LIBOR) [Member] |
Debt Instrument [Line Items] |
Basis spread on variable rate | 2.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = pesi_TermLoanMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember
Term Loan [Member] |
Debt Instrument [Line Items] |
Basis spread on variable rate | 3.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = pesi_TermLoanMember
Effective interest rate | 3.70%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = pesi_TermLoanMember
Promissory Note dated February 12, 2013 ("New Note") [Member] |
Debt Instrument [Line Items] |
Effective interest rate | 6.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = pesi_PromissoryNoteDatedFebruary122013NewNoteMember
Periodic payment, principal (in Dollars) | 10,000 us-gaap_DebtInstrumentPeriodicPaymentPrincipal / us-gaap_DebtInstrumentAxis = pesi_PromissoryNoteDatedFebruary122013NewNoteMember
Promissory Note dated August 2, 2013 [Member] |
Debt Instrument [Line Items] |
Effective interest rate | 2.99%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = pesi_PromissoryNoteDatedAugustSecond2013Member
Periodic payment, principal (in Dollars) | 125,000 us-gaap_DebtInstrumentPeriodicPaymentPrincipal / us-gaap_DebtInstrumentAxis = pesi_PromissoryNoteDatedAugustSecond2013Member

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- Definition Reference rate is used as a base rate to compute the effective interest rate. + References No definition available. + Details
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Namespace Prefix: | pesi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of the required periodic payments applied to principal. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DebtInstrumentAxis=pesi_RevolvingCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DebtInstrumentAxis=pesi_TermLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |