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Significant Accounting Policies (Details Narrative) (USD $)
12 Months Ended
Apr. 30, 2014
Impairment of oil and gas assets $ 4,713,973us-gaap_ImpairmentOfOilAndGasProperties
Montana [Member]  
Impairment of oil and gas assets 75,000us-gaap_ImpairmentOfOilAndGasProperties
/ us-gaap_StatementGeographicalAxis
= PTRC_MontanaMember
Kansas [Member]  
Impairment of oil and gas assets 4,638,973us-gaap_ImpairmentOfOilAndGasProperties
/ us-gaap_StatementGeographicalAxis
= PTRC_KansasMember
Bandolier Energy LLC. [Member]  
Proved developed oil and gas assets 2,460,632us-gaap_CostsIncurredAcquisitionOfOilAndGasPropertiesWithProvedReserves
/ us-gaap_BusinessAcquisitionAxis
= PTRC_BandolierEnergyLlcMember
Proven undeveloped oil and gas assets $ 5,921,641us-gaap_CostsIncurredAcquisitionOfUnprovedOilAndGasProperties
/ us-gaap_BusinessAcquisitionAxis
= PTRC_BandolierEnergyLlcMember