Commencement Of Agreement Month And Year

No definition available.

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- Definition

Debt instrument basis weighted average interest rate spread on variable rate.

+ References

No definition available.

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- Definition

Debt instrument interest one base rate basis for effective rate.

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No definition available.

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- Definition

Effective LIBOR loan rate.

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No definition available.

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- Definition

Payment For Settlement Of Interest Rate Swap

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No definition available.

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- Definition

Swap Agreement Month and Year

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No definition available.

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- Definition

Term of derivative interest rate swap.

+ References

No definition available.

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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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)

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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

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- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

+ Details

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

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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

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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-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

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- Definition

When presenting a range of interest rates, the highest effective rate for funds borrowed under the debt agreement as of the balance sheet date.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-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(a)(1))

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- Definition

When presenting a range of interest rates, the lowest effective rate for funds borrowed under the debt agreement as of the balance sheet date.

+ References

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- Details

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(2))

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- Definition

Amount of the required periodic payments including both interest and principal payments.

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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

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 470

-Section 50

-Paragraph 3

-Subparagraph (c)

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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.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

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-Section S99

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-Subparagraph (SX 210.7-03.16)

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- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

+ Details

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- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

+ References

+ Details

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- Definition

Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions).

+ References

+ Details

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

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- Definition

Weighted average interest rate of long-term debt outstanding.

+ References

No definition available.

+ Details

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- Definition

The cash inflow from bank borrowing during the year.

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

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-Section 45

-Paragraph 14

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Long-Term Debt - Additional Information (Detail) (USD $)	3 Months Ended		1 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Aug. 31, 2014	Jul. 31, 2015	Jul. 31, 2013	Jul. 29, 2014
Debt Instrument [Line Items]
Credit facility borrowing capacity	$ 250,000,000
Maturity date of amended and restated credit agreement	Jul. 30, 2017
Credit facility borrowing base	130,000,000
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 March 31, 2015) 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 (2.50% to 3.00% at March 31, 2015). At March 31, 2015, the Company had in place one base rate loan and one LIBO rate loan with effective rates of 5.00% and 2.91%, respectively.
Percentage for base rate loans at the prime rate	3.25%
Minimum range for applicable margin utilization rate	1.50%
Maximum range for applicable margin utilization rate	2.00%
Debt instrument interest one base rate basis for effective rate	5.00%
Effective LIBOR loan rate	2.91%pnrg_EffectiveLiborLoanRate
Outstanding borrowings under revolving credit facility	90,000,000us-gaap_LineOfCredit
Weighted-average interest rate of borrowings	3.46%
Credit facility remaining borrowing capacity	40,000,000
Debt instrument basis weighted average interest rate spread on variable rate	3.41%	3.55%
Interest swap agreements period	2 years
Settlement of interest rate swaps	74,000	54,000
Equipment Loan [Member]
Debt Instrument [Line Items]
Percentage for base rate loans at the prime rate	3.95%
Company's bank debt	7,000,000
Equipment Loan, face amount						10,000,000
Equipment Loan, monthly payment	184,000
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%
Credit facility remaining borrowing capacity	1,200,000
Company's bank debt	4,800,000
Equipment Loan, face amount							6,000,000
Equipment Loan, monthly payment	87,800
Equipment Loan, maturity date	Jul. 31, 2019
Additional equipment Loan, drawings			500,000	4,800,000
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%
Scenario, Forecast [Member] \| Additional Equipment Loan [Member]
Debt Instrument [Line Items]
Equipment Loan, maturity date					Jun. 30, 2020
Minimum [Member]
Debt Instrument [Line Items]
LIBOR rate loans	2.50%
Maximum [Member]
Debt Instrument [Line Items]
LIBOR rate loans	3.00%
Interest Rate Swap [Member]
Debt Instrument [Line Items]
Percentage for base rate loans at the prime rate	0.563%
Swap agreement date	2012-07
Commenced date	2014-01
Company's bank debt	$ 75,000,000