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ACQUISITIONS & DIVESTITURES (Details) - USD ($) | 9 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020
Business Acquisition [Line Items] |  |
Asset retirement obligation sold | $ (2,934,126) | $ 0
Asset retirement obligations for wells acquired | 662,704 |
Vin Fisher Operating, Inc |  |
Business Acquisition [Line Items] |  |
Cash Consideration | 2,000,000 |
Asset retirement obligations for wells acquired | $ 662,705 |

X
- Definition Amount of asset retirement obligations acquired during the period. + References No definition available. + Details
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Namespace Prefix: | rei_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of asset retirement obligations properties sold, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset. + References No definition available. + Details
Name: | rei_AssetRetirementObligationLiabilitiesPropertiesSold
Namespace Prefix: | rei_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the amount received from sale and transfer of wells and leases. + References No definition available. + Details
Name: | rei_CashConsideration
Namespace Prefix: | rei_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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_BusinessAcquisitionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=rei_VinFisherOperatingIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |