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Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Income Taxes And Tax Related [Line Items]
Alternative minimum tax credits	$ 5,722,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax	$ 5,852,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax
Allowed tax credit operating losses carry forward	620,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards	168,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Provision for uncertain tax positions	0us-gaap_LiabilityForUncertainTaxPositionsCurrent
Texas Franchise Tax [Member]
Income Taxes And Tax Related [Line Items]
Tax credit operating carry forward losses allowed after the period	0us-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	26,000us-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	$ 89,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = pnrg_TexasFranchiseTaxMember / us-gaap_TaxPeriodAxis = pnrg_TwoThousandSeventeenThroughTwoThousandTwentySixMember

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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



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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

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-Paragraph 6

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319



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The current portion of the amount recognized for uncertain tax positions as of the balance sheet date.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

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