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Note 4 - Capital Stock, Stock Plans and Stock Based Compensation (Details) - Stock-based Compensation Recognized (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | |
|---|---|---|
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Mar. 31, 2015
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Mar. 31, 2014
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| Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] | ||
| Stock Options | $ 33,000us-gaap_AllocatedShareBasedCompensationExpense | $ (18,000)us-gaap_AllocatedShareBasedCompensationExpense |
| Employee Stock Option [Member] | ||
| Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] | ||
| Stock Options |
13,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
(39,000)us-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 |
$ 20,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = pesi_DirectorStockOptionsMember |
$ 21,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = pesi_DirectorStockOptionsMember |
| X | ||||||||||
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- Definition
Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Details
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