Condensed Consolidated Balance Sheets (USD $)	Jan. 31, 2015	Apr. 30, 2014
Current Assets:
Cash and cash equivalents	$ 1,501,387	$ 8,352,949
Certificate of deposit - restricted	125,000
Accounts receivable	134,851us-gaap_AccountsReceivableNetCurrent	51,979us-gaap_AccountsReceivableNetCurrent
Prepaid expenses and other current assets	59,574	40,297
Total Current Assets	1,820,812us-gaap_AssetsCurrent	8,445,225us-gaap_AssetsCurrent
Oil and gas assets, net	17,145,352	8,941,592
Property, plant and equipment, net of accumulated depreciation of $309,550 and $302,275	64,911us-gaap_PropertyPlantAndEquipmentNet	930us-gaap_PropertyPlantAndEquipmentNet
Other assets	27,922us-gaap_OtherAssetsNoncurrent	6,000us-gaap_OtherAssetsNoncurrent
Total Other Assets	17,238,184us-gaap_AssetsNoncurrent	8,948,522us-gaap_AssetsNoncurrent
Total Assets	19,058,996us-gaap_Assets	17,393,747us-gaap_Assets
Current Liabilities:
Accounts payable and accrued expenses	288,479	480,637
Asset retirement obligations, current portion	460,778	481,658
Total Current Liabilities	749,257us-gaap_LiabilitiesCurrent	962,295us-gaap_LiabilitiesCurrent
Long-term liabilities:
Asset retirement obligations, net of current portion	447,806PTRC_AssetRetirementObligation1	336,352PTRC_AssetRetirementObligation1
Total Liabilities	1,197,063us-gaap_Liabilities	1,298,647us-gaap_Liabilities
Stockholders' Equity:
Preferred Shares - 5,000,000 authorized; par value $0.00001 per share; Preferred B shares - 29,500 authorized; 0 issued with a $100 stated value, par value $0.00001 per share
Common shares - 2,250,000,000 authorized; par value $0.00001 per share; Issued and outstanding; 818,567,746 and 818,567,746, respectively	8,186us-gaap_CommonStockValue	8,186us-gaap_CommonStockValue
Additional paid-in capital	28,650,374us-gaap_AdditionalPaidInCapital	27,748,045us-gaap_AdditionalPaidInCapital
Accumulated deficit	(15,185,307)	(11,661,131)
Total Stockholders' Equity	13,473,253us-gaap_StockholdersEquity	16,095,100us-gaap_StockholdersEquity
Non-controlling interests	4,388,680us-gaap_MinorityInterest
Total Stockholders' Equity	17,861,933	16,095,100
Total Liabilities and Stockholders' Equity	$ 19,058,996	$ 17,393,747

No authoritative reference available.

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Sum of the carrying values as of the balance sheet date of obligations incurred through that date and due within one year (or the operating cycle, if longer), including liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received, taxes, interest, rent and utilities, accrued salaries and bonuses, payroll taxes and fringe benefits.

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Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

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Oil and gas properties, net of depletion, carried under the full cost method.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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