XML 41 R19.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Joint Interest Agreement (Tables) | 6 Months Ended
--- | ---
Dec. 31, 2012
Joint Interest Agreement |
Schedule of amounts pertaining to participation in joint venture |
|  | December 31, 2012 |  | June 30, 2012 |
Advances to joint interest operating partner |  | $ | — |  | $ | 1,366,921 |
Due to joint interest partner |  | 1,383,991 |  | 3,217,975 |

X
- Details
Name: | epm_JointInterestDrillingArrangementDisclosureAbstract
Namespace Prefix: | epm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of amounts pertaining to participation in joint venture. + References No definition available. + Details
Name: | epm_ScheduleOfJointVenturesActivityTableTextBlock
Namespace Prefix: | epm_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration