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Salary Deferral Plan (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Salary Deferral Plan (Textual) [Abstract]
Salary deferral plan, discretionary and matching contribution	$ 463,000	$ 447,000

X

- Definition

Defined salary deferral plan employer discretionary contribution amount.

+ References

No definition available.

+ Details

Name:	pnrg_DefinedSalaryDeferralPlanEmployerDiscretionaryContributionAmount
Namespace Prefix:	pnrg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Details

Name:	pnrg_SalaryDeferralPlanTextualAbstract
Namespace Prefix:	pnrg_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration