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Income Taxes - Additional Information (Detail) (USD $) | 12 Months Ended |
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Dec. 31, 2014 | Dec. 31, 2013
Income Taxes And Tax Related [Line Items] |  |
Alternative minimum tax credits | $ 5,722,000 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax | $ 5,852,000 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax
Allowed tax credit operating losses carry forward | 620,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | 168,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Provision for uncertain tax positions | 0 us-gaap_LiabilityForUncertainTaxPositionsCurrent |
Texas Franchise Tax [Member] |  |
Income Taxes And Tax Related [Line Items] |  |
Tax credit operating carry forward losses allowed after the period | 0 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration / us-gaap_IncomeTaxAuthorityAxis = pnrg_TexasFranchiseTaxMember |
Tax credit operating carry forward losses allowed after the period, Description | No credit may be carried forward past 2026. |
Texas Franchise Tax [Member] | 2014 through 2016 [Member] |  |
Income Taxes And Tax Related [Line Items] |  |
Allowed tax credit operating losses carry forward | 26,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = pnrg_TexasFranchiseTaxMember / us-gaap_TaxPeriodAxis = pnrg_TwoThousandFourteenThroughTwoThousandSixteenMember |
Texas Franchise Tax [Member] | 2017 through 2026 [Member] |  |
Income Taxes And Tax Related [Line Items] |  |
Allowed tax credit operating losses carry forward | $ 89,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = pnrg_TexasFranchiseTaxMember / us-gaap_TaxPeriodAxis = pnrg_TwoThousandSeventeenThroughTwoThousandTwentySixMember |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible alternative minimum tax credit carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Alternative Minimum Tax -URI http://asc.fasb.org/extlink&oid=6504908 + Details
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