XML 59 R47.htm IDEA: XBRL DOCUMENT
v3.20.4

Stock-Based Incentive Plan - Narrative (Details) |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 09, 2020 shares | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) tranche | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) tranche shares | Jun. 30, 2020 $ / shares | Dec. 08, 2016 shares
Restricted Stock and Contingent Restricted Stock |  |  |  |  |  |  |
Stock-Based Incentive Plan |  |  |  |  |  |  |
Stock-based compensation expense | $ |  | $ 317,506 | $ 236,190 | $ 617,857 | $ 568,203 |  |
Restricted Stock, Service-Based |  |  |  |  |  |  |
Stock-Based Incentive Plan |  |  |  |  |  |  |
Granted (in shares) |  |  |  | 341,077 |  |  |
Weighted average fair value (in dollars per share) | $ / shares |  | $ 3.40 |  | $ 3.40 |  |  |
Restricted Stock, Market-Based |  |  |  |  |  |  |
Stock-Based Incentive Plan |  |  |  |  |  |  |
Granted (in shares) |  |  |  | 246,160 |  |  |
Weighted average fair value (in dollars per share) | $ / shares |  | 3.38 |  | $ 3.38 |  |  |
Contingent Restricted Stock grants |  |  |  |  |  |  |
Stock-Based Incentive Plan |  |  |  |  |  |  |
Granted (in shares) |  |  |  | 123,080 |  |  |
Weighted average fair value (in dollars per share) | $ / shares |  | $ 2.85 |  | $ 2.85 |  | $ 3.50 |
Restricted Stock and Contingent Restricted Stock, Other |  |  |  |  |  |  |
Stock-Based Incentive Plan |  |  |  |  |  |  |
Vesting period |  |  |  | 1 year |  |  |
Restricted Stock, Performance-Based |  |  |  |  |  |  |
Stock-Based Incentive Plan |  |  |  |  |  |  |
Share awards, outstanding (in shares) |  | 0 |  | 0 |  |  |
2016 Plan |  |  |  |  |  |  |
Stock-Based Incentive Plan |  |  |  |  |  |  |
Number of shares of common stock authorized for issuance under plan (in shares) |  |  |  |  |  |  | 1,100,000
Number of additional shares authorized (in shares) | 2,500,000 |  |  |  |  |  |
Number of shares remaining available for grant under plan (in shares) |  | 2,230,696 |  | 2,230,696 |  |  |
Minimum | Restricted Stock, Service-Based |  |  |  |  |  |  |
Stock-Based Incentive Plan |  |  |  |  |  |  |
Vesting period |  |  |  | 3 years |  |  |
Minimum | Restricted Stock, Market-Based |  |  |  |  |  |  |
Stock-Based Incentive Plan |  |  |  |  |  |  |
Vesting period |  |  |  | 2 years |  |  |
Maximum | Restricted Stock and Contingent Restricted Stock |  |  |  |  |  |  |
Stock-Based Incentive Plan |  |  |  |  |  |  |
Expiration period |  |  |  | 4 years |  |  |
Maximum | Restricted Stock, Service-Based |  |  |  |  |  |  |
Stock-Based Incentive Plan |  |  |  |  |  |  |
Vesting period |  |  |  | 4 years |  |  |
Maximum | Restricted Stock, Market-Based |  |  |  |  |  |  |
Stock-Based Incentive Plan |  |  |  |  |  |  |
Vesting period |  |  |  | 3 years |  |  |
Employee | Restricted Stock, Service-Based |  |  |  |  |  |  |
Stock-Based Incentive Plan |  |  |  |  |  |  |
Granted (in shares) |  |  |  | 290,553 |  |  |
Employee | Restricted Stock, Market-Based |  |  |  |  |  |  |
Stock-Based Incentive Plan |  |  |  |  |  |  |
Granted (in shares) |  |  |  | 246,160 |  |  |
Employee | Contingent Restricted Stock grants |  |  |  |  |  |  |
Stock-Based Incentive Plan |  |  |  |  |  |  |
Granted (in shares) |  |  |  | 123,080 |  |  |
Chief Executive Officer | Restricted Stock, Service-Based |  |  |  |  |  |  |
Stock-Based Incentive Plan |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  | 48,872 |  |
Weighted average fair value (in dollars per share) | $ / shares |  | $ 2.79 |  | $ 2.79 |  |  |
Number of vesting tranches | tranche |  |  | 3 |  | 3 |  |
Chief Executive Officer | Restricted Stock, Market-Based |  |  |  |  |  |  |
Stock-Based Incentive Plan |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  | 200,000 |  |
Number of vesting tranches | tranche |  |  | 4 |  | 4 |  |
Chief Executive Officer | Restricted Stock, Service And Market Based |  |  |  |  |  |  |
Stock-Based Incentive Plan |  |  |  |  |  |  |
Share awards, outstanding (in shares) |  | 50,524 |  | 50,524 |  |  |
Weighted average fair value (in dollars per share) | $ / shares |  | $ 5.15 |  | $ 5.15 |  |  |

X
- Definition Share-based Compensation Arrangement by Share-based Payment Award, Number Of Vesting Tranches + References No definition available. + Details
Name: | epm_SharebasedCompensationArrangementbySharebasedPaymentAwardNumberOfVestingTranches
Namespace Prefix: | epm_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
Name: | us-gaap_AllocatedShareBasedCompensationExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of equity instruments other than options outstanding, including both vested and non-vested instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of additional shares authorized for issuance under share-based payment arrangement. + References No definition available. + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of shares authorized for issuance under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
Name: | us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_AwardTypeAxis=epm_RestrictedStockandContingentRestrictedStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=epm_RestrictedStockServiceBasedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=epm_RestrictedStockMarketBasedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=epm_ContingentRestrictedStockGrantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=epm_RestrictedStockandContingentRestrictedStockOtherAwardsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=epm_RestrictedStockPerformanceBasedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PlanNameAxis=epm_A2016EquityIncentivePlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_TitleOfIndividualAxis=epm_EmployeeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_TitleOfIndividualAxis=srt_ChiefExecutiveOfficerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=epm_RestrictedStockServiceAndMarketBasedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |