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Note 17 - Segment Reporting - Segment Revenue by Customer (Details) - Federal Government [Member] - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Revenues	$ 27,354,000	$ 36,105,000
Treatment [Member]
Revenues	21,434,000	30,130,000
Services [Member]
Revenues	$ 5,920,000	$ 5,975,000

X

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

+ Details

Name:	us-gaap_Revenues
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_MajorCustomersAxis=pesi_FederalGovernmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=pesi_TreatmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=pesi_ServicesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: