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Restricted Cash and Cash Equivalents (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Restricted Cash and Cash Equivalents (Textual) [Abstract]
Restricted cash and cash equivalents pertaining to oil and gas revenue payments	$ 4.44	$ 4.39

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- Definition

Restricted cash and cash equivalents pertaining to oil and gas revenue payments.

+ References

No definition available.

+ Details

Name:	pnrg_RestrictedCashAndCashEquivalentsPertainingToOilAndGasRevenuePayments
Namespace Prefix:	pnrg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Details

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