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Note 3 - Intangible Assets (Details) (USD $) | 3 Months Ended
--- | ---
Mar. 31, 2015 | Mar. 31, 2014
Note 3 - Intangible Assets (Details) [Line Items] |  |
Amortization of Intangible Assets | $ 127,000 us-gaap_AmortizationOfIntangibleAssets | $ 176,000 us-gaap_AmortizationOfIntangibleAssets
PCB Permit [Member] |  |
Note 3 - Intangible Assets (Details) [Line Items] |  |
Number Of Definte-Lived Permits | 1 pesi_NumberOfDefiniteLivedPermits / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = pesi_PCBPermitMember |

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Namespace Prefix: | pesi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the number of definite lived permits. + References No definition available. + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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Period Type: | duration

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