Supplemental Disclosures about Oil and Natural Gas Producing Properties (unaudited) - Narrative (Details) - USD ($)	12 Months Ended
Jun. 30, 2020	Jun. 30, 2019
Oil and Gas Exploration and Production Industries Disclosures [Abstract]
Asset retirement obligations	$ 918,137	$ 86,384
Period considered for unweighted arithmetic average	12 months
Period considered for determining unweighted arithmetic average of first day of month, commodity Prices	12 months

Amount of asset retirement obligations incurred during the period, net of certain increases or decreases in the amount of the asset retirement obligation during the current period that may include changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation.

No definition available.

Name:	epm_AssetRetirementObligationLiabilitiesIncurredNet
Namespace Prefix:	epm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration