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10. PENSION PLANS (Details Narrative) - Retirement Plan [Member] $ in Thousands | 12 Months Ended
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Dec. 31, 2016 USD ($)
Expected contributions by the company | $ 0
Expected net periodic benefit cost for 2017 | $ 500

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- Definition Amount of benefits from a defined benefit plan expected to be paid in the second rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInNextFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_DefinedContributionPlanTypeAxis=peix_RetirementPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |