Annual report pursuant to Section 13 and 15(d)

Note 6 - Capital Stock, Stock Plans, Warrants, and Stock Based Compensation (Details) - Stock-based Compensation Recognized

v2.4.1.9
Note 6 - Capital Stock, Stock Plans, Warrants, and Stock Based Compensation (Details) - Stock-based Compensation Recognized (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]    
Stock Options $ 34,000us-gaap_AllocatedShareBasedCompensationExpense $ 125,000us-gaap_AllocatedShareBasedCompensationExpense
Employee Stock Option [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]    
Stock Options (14,000)us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
80,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Director Stock Options [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]    
Stock Options $ 48,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= pesi_DirectorStockOptionsMember
$ 45,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= pesi_DirectorStockOptionsMember