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SEGMENTS. (Details Narrative) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) Number | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Number of operating segments | Number | 2 |  |
Ethanol Production [Member] |  |  |
Management fees | $ 10,248,000 | $ 9,744,000 | $ 9,968,000
Marketing and Distribution [Member] |  |  |
Management fees | $ 2,160,000 | $ 2,160,000 | $ 3,000,000

X
- Definition It represents the value of management fees. + References No definition available. + Details
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Namespace Prefix: | peix_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
Name: | us-gaap_NumberOfOperatingSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=peix_EthanolProductionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=peix_MarketingAndDistributionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |