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Stock Options and Other Compensation - Additional Information (Detail) (USD $)
Dec. 31, 2014
Dec. 31, 2013
May 31, 1989
Officers
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options outstanding, shares 767,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 767,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber  
Options exercisable, shares 767,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber 767,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber  
Number of key executive officers to whom non-statutory stock options granted     4pnrg_NumberOfKeyExecutiveOfficerToWhomNonStatutoryStockOptionGranted
Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Average exercise price 1.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
1.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Average exercise price 1.25us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
1.25us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_RangeAxis
= us-gaap_MaximumMember