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v3.23.1

Operating Segments - Customers (Details) - customer | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Natural gas |  |
Concentration risk |  |
Number of customers | 26 | 30
Customer Concentration risk |  |
Concentration risk |  |
Threshold concentration risk for reporting (as a percent) | 10.00% | 10.00%

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- Definition Represents the number customers of the entity from which revenue was earned. + References No definition available. + Details
Name: | epsn_ConcentrationRiskNumberOfCustomers
Namespace Prefix: | epsn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Threshold concentration risk percentage for disclosure requirement. + References No definition available. + Details
Name: | epsn_ThresholdConcentrationRiskPercentage
Namespace Prefix: | epsn_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- 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_ConcentrationRiskLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_ProductOrServiceAxis=srt_NaturalGasReservesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_ConcentrationRiskByTypeAxis=us-gaap_CustomerConcentrationRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |