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5. SEGMENTS (Details Narrative) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Ethanol Production [Member] |  |  |
Management fees | $ 6,000 | $ 8,800 | $ 5,600
Marketing and Distribution [Member] |  |  |
Management fees | $ 3,900 | $ 3,900 | $ 3,600

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- Definition Amount of expenses related to the managing member or general partner for management of the day-to-day business functions of the limited liability company (LLC) or limited partnership (LP). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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