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Note 13 - Employment Agreements and Management Incentive Plans ("MIP") (Details Textual) - USD ($) | Jan. 31, 2017 | Jan. 19, 2017
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Executive Vice President/Chief Operating Officer [Member] |  |
Employment Agreement, Term | 3 years |
Employment Agreement, Annual Base Salary | $ 267,000 |
Deferred Compensation Arrangement with Individual, Term for Base Salary | 1 year |
Deferred Compensation Arrangement with Individual, Cash Awards Granted, Minimum, Percentage |  | 5.00%
Deferred Compensation Arrangement with Individual, Cash Awards Granted, Maximum, Percentage |  | 100.00%
Deferred Compensation Arrangement with Individual, Cash Awards Granted, Minimum, Amount |  | $ 13,350
Deferred Compensation Arrangement with Individual, Cash Awards Granted, Maximum, Amount |  | $ 267,000
Chief Executive Officer [Member] |  |
Deferred Compensation Arrangement with Individual, Cash Awards Granted, Minimum, Percentage |  | 5.00%
Deferred Compensation Arrangement with Individual, Cash Awards Granted, Maximum, Percentage |  | 100.00%
Deferred Compensation Arrangement with Individual, Cash Awards Granted, Minimum, Amount |  | $ 13,962
Deferred Compensation Arrangement with Individual, Cash Awards Granted, Maximum, Amount |  | $ 279,248
Chief Financial Officer [Member] |  |
Deferred Compensation Arrangement with Individual, Cash Awards Granted, Minimum, Percentage |  | 5.00%
Deferred Compensation Arrangement with Individual, Cash Awards Granted, Maximum, Percentage |  | 100.00%
Deferred Compensation Arrangement with Individual, Cash Awards Granted, Minimum, Amount |  | $ 11,475
Deferred Compensation Arrangement with Individual, Cash Awards Granted, Maximum, Amount |  | $ 229,494

X
- Definition Maximum cash incentive payable under Management Incentive Plan. + References No definition available. + Details
Name: | pesi_DeferredCompensationArrangementWithIndividualCashAwardsGrantedMaximumAmount
Namespace Prefix: | pesi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Maximum cash incentive payable expressed as a percentage of the individual base salary. + References No definition available. + Details
Name: | pesi_DeferredCompensationArrangementWithIndividualCashAwardsGrantedMaximumPercentage
Namespace Prefix: | pesi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Minimum cash incentive payable under Management Incentive Plan. + References No definition available. + Details
Name: | pesi_DeferredCompensationArrangementWithIndividualCashAwardsGrantedMinimumAmount
Namespace Prefix: | pesi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Minimum cash incentive payable expressed as a percentage of the individual base salary. + References No definition available. + Details
Name: | pesi_DeferredCompensationArrangementWithIndividualCashAwardsGrantedMinimumPercentage
Namespace Prefix: | pesi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Term for base salary in case of employment termination under the deferred compensation arrangement. + References No definition available. + Details
Name: | pesi_DeferredCompensationArrangementWithIndividualTermForBaseSalary
Namespace Prefix: | pesi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the annual base salary under the terms of the employment agreement. + References No definition available. + Details
Name: | pesi_EmploymentAgreementAnnualBaseSalary
Namespace Prefix: | pesi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the the effective term of employment agreements with executives. + References No definition available. + Details
Name: | pesi_EmploymentAgreementTerm
Namespace Prefix: | pesi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_TitleOfIndividualAxis=pesi_ExecutiveVicePresidentAndChiefOperatingOfficerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TitleOfIndividualAxis=us-gaap_ChiefExecutiveOfficerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TitleOfIndividualAxis=us-gaap_ChiefFinancialOfficerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |