XML 29 R24.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Property and Equipment (Details) (USD $) |  |  |  |  | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2012 | Jun. 30, 2012 | Sep. 30, 2012 Mississippi Lime | Jun. 30, 2012 Mississippi Lime | Sep. 30, 2012 Woodford Shale properties | Sep. 30, 2012 Oil and natural gas properties | Jun. 30, 2012 Oil and natural gas properties | Sep. 30, 2012 Other Property and Equipment | Jun. 30, 2012 Other Property and Equipment
Property and Equipment |  |  |  |  |  |  |  |  |
Property and Equipment, Net | $ 42,393,583 | $ 40,568,443 |  |  |  | $ 42,313,561 | $ 40,476,172 | $ 80,022 | $ 92,271
Oil and natural gas properties |  |  |  |  |  |  |  |  |
Property costs subject to amortization | 41,232,889 | 40,874,244 |  |  |  |  |  |  |
Less: Accumulated depreciation, depletion, and amortization | (6,701,388) | (6,440,166) |  |  |  |  |  |  |
Unproved properties not subject to amortization | 7,782,060 | 6,042,094 |  |  |  |  |  |  |
Other property and equipment |  |  |  |  |  |  |  |  |
Furniture, fixtures and office equipment, at cost | 322,515 | 322,514 |  |  |  |  |  |  |
Less: Accumulated depreciation | (242,493) | (230,243) |  |  |  |  |  |  |
Unevaluated acreage included in unproved properties not subject to amortization |  |  | 7,800,000 | 6,000,000 |  |  |  |  |
Impaired assets transferred in prior period |  |  |  |  | $ 800,000 |  |  |  |

X
- Definition Represents the amount of impaired assets transferred from unevaluated pool to full cost pool in prior period. + References No definition available. + Details
Name: | epm_ImpairedOilAndNaturalGasPropertiesTransferredInPriorPeriod
Namespace Prefix: | epm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the amount of unevaluated acreage included in unproved properties not subject to amortization. + References No definition available. + Details
Name: | epm_OilAndNaturalGasPropertiesExcludedFromAmortizationUnevaluatedAcreage
Namespace Prefix: | epm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The sum of the capitalized costs incurred, as of the balance sheet date, of unproved properties excluded from amortization including acquisition costs, exploration costs, development costs, and production costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10.(c)(7)(ii)) -URI http://asc.fasb.org/extlink&oid=21918352&loc=d3e511914-122862 + Details
Name: | us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationCumulative
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Depletion of oil and gas property carried under the full cost method. + References No definition available. + Details
Name: | us-gaap_OilAndGasPropertyFullCostMethodDepletion
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Oil and gas properties, gross, carried under the full cost method. + References No definition available. + Details
Name: | us-gaap_OilAndGasPropertyFullCostMethodGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_OilAndGasPropertyFullCostMethodNetAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 12 -Paragraph 5 -Subparagraph b, c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph a -Article 5 + Details
Name: | us-gaap_PropertyPlantAndEquipmentNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This element represents capitalized assets classified as property, plant and equipment not otherwise defined in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
Name: | us-gaap_PropertyPlantAndEquipmentOther
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The cumulative amount of depreciation (related to capitalized assets classified as property, plant and equipment not otherwise defined in the taxonomy) that has been recognized in the income statement. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentOtherAccumulatedDepreciation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentOtherNetAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration