Quarterly report pursuant to Section 13 or 15(d)

Note 6 - Long Term Debt (Details) - Long-term Debt Instruments (Parentheticals)

v2.4.1.9
Note 6 - Long Term Debt (Details) - Long-term Debt Instruments (Parentheticals) (USD $)
 3 Months Ended
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) 190,000us-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) 10,000us-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) 125,000us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ us-gaap_DebtInstrumentAxis
= pesi_PromissoryNoteDatedAugustSecond2013Member