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Note 14 - Profit Sharing Plan (Details Textual) | 12 Months Ended
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Dec. 31, 2015 USD ($)
Minimum Age for Full Time Employees to Participate In Plan | 18
Number of Quarterly Open Periods for Enrollment | 4
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent | 100.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay | 25.00%
Defined Contribution Plan Employers Contribution Vesting Period | 5 years
Defined Contribution Plan, Employer Discretionary Contribution Amount | $ 303,000

X
- Definition Refers to vesting period of employers contribution. + References No definition available. + Details
Name: | pesi_DefinedContributionPlanEmployersContributionVestingPeriod
Namespace Prefix: | pesi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Refers to minimum age for full time employees to participate in the plan. + References No definition available. + Details
Name: | pesi_MinimumAgeForFullTimeEmployeesToParticipateInPlan
Namespace Prefix: | pesi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of quarterly open periods for enrollment in the Company's 401(k) Plan. + References No definition available. + Details
Name: | pesi_NumberOfQuarterlyOpenPeriodsForEnrollment
Namespace Prefix: | pesi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration