Quarterly report pursuant to Section 13 or 15(d)

BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Details Textual)

v2.4.1.9
BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Details Textual) (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Basis Of Presentation And Significant Accounting Policies [Line Items]    
Depreciation $ 53,755us-gaap_Depreciation $ 21,686us-gaap_Depreciation
Amortization expense 3,654,298rei_AmortizationExpense1 1,530,196rei_AmortizationExpense1
Depletion At The Rate Per Barrel $ 25.65rei_DepletionAtRatePerBarrel $ 23.07rei_DepletionAtRatePerBarrel
Estimated Present Value Of Future Net Revenues From Proved Reserves Discounted At An Interest Rate 10.00%rei_EstimatedPresentValueOfFutureNetRevenuesFromProvedReservesDiscountedAtInterestRate  
Maximum [Member]    
Basis Of Presentation And Significant Accounting Policies [Line Items]    
Property, Plant and Equipment, Useful Life 7 years  
Minimum [Member]    
Basis Of Presentation And Significant Accounting Policies [Line Items]    
Property, Plant and Equipment, Useful Life 5 years  
Sales Revenue, Net [Member] | Customer One [Member]    
Basis Of Presentation And Significant Accounting Policies [Line Items]    
Concentration Risk, Percentage 50.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_MajorCustomersAxis
= rei_CustomerOneMember 		 
Sales Revenue, Net [Member] | Customer Two [Member]    
Basis Of Presentation And Significant Accounting Policies [Line Items]    
Concentration Risk, Percentage 34.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_MajorCustomersAxis
= rei_CustomerTwoMember 		 
Sales Revenue, Net [Member] | Customer Three [Member]    
Basis Of Presentation And Significant Accounting Policies [Line Items]    
Concentration Risk, Percentage 10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_MajorCustomersAxis
= rei_CustomerThreeMember 		 
Accounts Receivable [Member] | Customer One [Member]    
Basis Of Presentation And Significant Accounting Policies [Line Items]    
Concentration Risk, Percentage 37.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_MajorCustomersAxis
= rei_CustomerOneMember 		 
Accounts Receivable [Member] | Customer Two [Member]    
Basis Of Presentation And Significant Accounting Policies [Line Items]    
Concentration Risk, Percentage 40.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_MajorCustomersAxis
= rei_CustomerTwoMember 		 
Accounts Receivable [Member] | Customer Three [Member]    
Basis Of Presentation And Significant Accounting Policies [Line Items]    
Concentration Risk, Percentage 8.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_MajorCustomersAxis
= rei_CustomerThreeMember