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ASSET RETIREMENT OBLIGATION (Details Textual)	9 Months Ended
	Sep. 30, 2017 USD ($)
Asset Retirement Obligation [Line Items]
Well Service Expenses Per Well	$ 18,000
Well Service Expense	$ 414,000

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:	rei_AssetRetirementObligationLineItems
Namespace Prefix:	rei_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Cost incurred related to one well drilled or completed for the purpose of supporting production.

+ References

No definition available.

+ Details

Name:	rei_WellServiceExpensesPerWell
Namespace Prefix:	rei_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Cost incurred related to well drilled or completed for the purpose of supporting production.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.2)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 23
-URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62136-109447

+ Details

Name:	us-gaap_WellServiceExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration