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Long-Term Debt - Additional Information (Detail) (USD $) | 12 Months Ended | 1 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2014 | Aug. 31, 2014 | Jul. 31, 2013 | Jul. 29, 2014
Debt Instrument [Line Items] |  |  |  |  |  |
Credit facility borrowing capacity | $ 250,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity |  | $ 250,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity |  |  |
Maturity date of amended and restated credit agreement | Jul. 30, 2017 |  |  |  |  |
Maximum percentage of production | 90.00%pnrg_PercentageOfProvedDevelopedProducingReservesMaximumOfProductionAvailableToEnterIntoCommodityHedgeAgreements |  | 90.00%pnrg_PercentageOfProvedDevelopedProducingReservesMaximumOfProductionAvailableToEnterIntoCommodityHedgeAgreements |  |  |
Restrictions on the payment of dividends, distributions or purchase of treasury stock | 5,000,000 pnrg_MaximumAmountCompanyCanUtilizedToPaymentOfDividendDistributionAndPurchaseOfTreasuryShares |  |  |  |  |
Credit facility borrowing base | 130,000,000 us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity |  | 130,000,000 us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity |  |  |
Credit facility, interest rate description | The Company's borrowing rates in the credit facility provide for base rate loans at the prime rate (3.25% at December 31, 2014) plus applicable margin utilization rates that range from 1.50% to 2.00%, and LIBO rate loans at LIBO published rates plus applicable utilization rates that range from 2.50% to 3.00%. At December 31, 2014, the Company had in place one base rate loan and one LIBO rate loan with effective rates of 4.75% and 2.65%, respectively. |  |  |  |  |
Percentage for base rate loans at the prime rate | 3.25%us-gaap_DebtInstrumentInterestRateEffectivePercentage |  | 3.25%us-gaap_DebtInstrumentInterestRateEffectivePercentage |  |  |
Minimum range for applicable margin utilization rate | 1.50%us-gaap_DebtInstrumentInterestRateEffectivePercentageRateRangeMinimum |  |  |  |  |
Maximum range for applicable margin utilization rate | 2.00%us-gaap_DebtInstrumentInterestRateEffectivePercentageRateRangeMaximum |  |  |  |  |
Debt instrument interest one base rate basis for effective rate | 4.75%pnrg_DebtInstrumentInterestOneBaseRateBasisForEffectiveRate |  | 4.75%pnrg_DebtInstrumentInterestOneBaseRateBasisForEffectiveRate |  |  |
Effective LIBOR loan rate | 2.65%pnrg_EffectiveLiborLoanRate |  | 2.65%pnrg_EffectiveLiborLoanRate |  |  |
Outstanding borrowings under revolving credit facility | 88,900,000 us-gaap_LineOfCredit |  | 88,900,000 us-gaap_LineOfCredit |  |  |
Weighted-average interest rate of borrowings | 3.42%us-gaap_LongtermDebtWeightedAverageInterestRate |  | 3.42%us-gaap_LongtermDebtWeightedAverageInterestRate |  |  |
Credit facility remaining borrowing capacity | 41,100,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity |  | 41,100,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity |  |  |
Debt instrument basis weighted average interest rate spread on variable rate | 3.53%pnrg_DebtInstrumentBasisWeightedAverageInterestRateSpreadOnVariableRate | 3.58%pnrg_DebtInstrumentBasisWeightedAverageInterestRateSpreadOnVariableRate |  |  |  |
Equipment Loan, maturity date | Jun. 30, 2020 |  |  |  |  |
Equipment Loan [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Percentage for base rate loans at the prime rate | 3.95%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = pnrg_EquipmentLoanMember |  | 3.95%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = pnrg_EquipmentLoanMember |  |  |
Company's bank debt | 7,500,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = pnrg_EquipmentLoanMember |  | 7,500,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = pnrg_EquipmentLoanMember |  |  |
Equipment Loan, face amount |  |  |  |  | 10,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = pnrg_EquipmentLoanMember |
Equipment Loan, monthly payment | 184,000 us-gaap_DebtInstrumentPeriodicPayment / us-gaap_DebtInstrumentAxis = pnrg_EquipmentLoanMember |  |  |  |  |
Equipment Loan, maturity date | Jul. 31, 2018 |  |  |  |  |
Additional Equipment Loan [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Percentage for base rate loans at the prime rate | 3.40%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = pnrg_AdditionalEquipmentLoanMember |  | 3.40%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = pnrg_AdditionalEquipmentLoanMember |  |  |
Credit facility remaining borrowing capacity | 1,200,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_DebtInstrumentAxis = pnrg_AdditionalEquipmentLoanMember |  | 1,200,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_DebtInstrumentAxis = pnrg_AdditionalEquipmentLoanMember |  |  |
Company's bank debt | 4,500,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = pnrg_AdditionalEquipmentLoanMember |  | 4,500,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = pnrg_AdditionalEquipmentLoanMember |  |  |
Equipment Loan, face amount |  |  |  |  |  | 6,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = pnrg_AdditionalEquipmentLoanMember
Equipment Loan, monthly payment | 87,800 us-gaap_DebtInstrumentPeriodicPayment / us-gaap_DebtInstrumentAxis = pnrg_AdditionalEquipmentLoanMember |  |  |  |  |
Equipment Loan, maturity date | Jul. 31, 2019 |  |  |  |  |
Additional equipment Loan, drawings |  |  | 500,000 us-gaap_ProceedsFromBankDebt / us-gaap_DebtInstrumentAxis = pnrg_AdditionalEquipmentLoanMember | 4,800,000 us-gaap_ProceedsFromBankDebt / us-gaap_DebtInstrumentAxis = pnrg_AdditionalEquipmentLoanMember |  |
Equipment Loan, interest rate description | Interim draws on this facility carry a floating interest rate, payable monthly at the LIBO published rate plus 2.50% and in July 2015 will convert along with subsequent draws |  |  |  |  |
Additional Equipment Loan [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
LIBOR rate loans | 2.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = pnrg_AdditionalEquipmentLoanMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |  |  |
Minimum [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
LIBOR rate loans | 2.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |
Maximum [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
LIBOR rate loans | 3.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |
Interest Rate Swap [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Percentage for base rate loans at the prime rate | 0.563%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember |  | 0.563%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember |  |  |
Interest swap agreements period | 2 years |  |  |  |  |
Swap agreement date | 2012-07 |  |  |  |  |
Commenced date | 2014-01 |  |  |  |  |
Company's bank debt | 75,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember |  | 75,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember |  |  |
Settlement of interest rate swaps | $ 289,000 pnrg_PaymentForSettlementOfInterestRateSwap / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember |  |  |  |  |

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- Definition Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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