Annual report pursuant to Section 13 and 15(d)

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Accounting Policies
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Notes Details

Note 5 - Permit and Other Intangible Assets - Other Intangible Assets (Details)

v3.6.0.2

Note 5 - Permit and Other Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Gross Carrying Amount	$ 4,897	$ 4,849
Accumulated Amortization	(3,059)	(2,611)
Finite-Lived Intangible Assets, Net	$ 1,838	2,238
Patents [Member]
Finite-Lived Intangible Asset, Useful Life	17 years
Gross Carrying Amount	$ 577	539
Accumulated Amortization	(274)	(203)
Finite-Lived Intangible Assets, Net	$ 303	336
Patents [Member] \| Minimum [Member]
Finite-Lived Intangible Asset, Useful Life	3 years
Computer Software, Intangible Asset [Member]
Finite-Lived Intangible Asset, Useful Life	3 years
Gross Carrying Amount	$ 405	395
Accumulated Amortization	(383)	(364)
Finite-Lived Intangible Assets, Net	$ 22	31
Customer Relationships [Member]
Finite-Lived Intangible Asset, Useful Life	12 years
Gross Carrying Amount	$ 3,370	3,370
Accumulated Amortization	(1,974)	(1,671)
Finite-Lived Intangible Assets, Net	$ 1,396	1,699
Permits [Member]
Finite-Lived Intangible Asset, Useful Life	10 years
Gross Carrying Amount	$ 545	545
Accumulated Amortization	(428)	(373)
Finite-Lived Intangible Assets, Net	$ 117	$ 172

- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_FiniteLivedIntangibleAssetUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

+ Details

Name:	us-gaap_FiniteLivedIntangibleAssetsGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=pesi_PermitsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: