XML 40 R50.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Related Party Transactions (Details) (Laird Q. Cagan, USD $) |  |  | 1 Months Ended | 12 Months Ended |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
May 06, 2005 | Jun. 30, 2004 | May 31, 2012 Common stock | Mar. 31, 2011 Common stock | Jun. 30, 2012 CMCP | May 26, 2004 CMCP | Oct. 31, 2009 CMCP Common stock | Jun. 30, 2012 CMCP High end of range | Jun. 30, 2012 CMCP Low end of range
Related Party Transactions |  |  |  |  |  |  |  |  |
Cash fees as a percentage of gross equity proceeds in private equity financings |  |  |  |  |  |  |  | 8.00% | 4.00%
Fixed warrant fee as a percentage of gross equity proceeds in private equity financings |  |  |  |  | 4.00% |  |  |  |
Number of shares of common stock issued through a net cashless exercise of a placement warrant |  |  | 65,261 | 58,350 |  |  | 119,795 |  |
Number of shares of common stock that can be purchased against warrants, under the right to purchase | 91,200 | 66,943 |  |  |  | 165,000 |  |  |
Exercise price of warrants (in dollars per share) | $ 2.50 | $ 1.00 |  |  |  | $ 1.00 |  |  |

X
- Definition The number of shares issued as a result of the cashless exercise of warrants during the period, net of shares cancelled in lieu of payment of cash consideration. + References No definition available. + Details
Name: | epm_ClassOfWarrantOrRightWarrantsExercisedSharesIssuedNetOfSharesCancelledInLieuOfCashPayment
Namespace Prefix: | epm_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the cash fees as a percentage of gross equity proceeds that could be earned by the related party for providing financial advisory services. + References No definition available. + Details
Name: | epm_RelatedPartyTransactionCashFeesAsPercentageOfGrossEquityProceeds
Namespace Prefix: | epm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the fixed warrant fees as a percentage of gross equity proceeds that could be earned by the related party for providing financial advisory services. + References No definition available. + Details
Name: | epm_RelatedPartyTransactionFixedWarrantFeePercentage
Namespace Prefix: | epm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The exercise price of each class of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Subparagraph 4 -Article 4 + Details
Name: | us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights
Namespace Prefix: | us-gaap_
Data Type: | us-types:perUnitItemType
Balance Type: | na
Period Type: | instant

X
- Definition The specified number of securities that each class of warrants or rights outstanding give the holder the right but not the obligation to purchase from the issuer at a specific price, on or before a certain date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(2)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Subparagraph 2 -Article 4 + Details
Name: | us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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