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Fair Value Measurements (Summary Of Unobservable Inputs For Level 3 Fair Value Measurements) (Details)
3 Months Ended
Dec. 31, 2017
USD ($)
Oil Costless Collars [Member]  
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]  
Unobservable Input Oil price volatility curve
Weighted Average 12.58%
Fair Value Assets (Liabilities) $ (616,236)
Oil Costless Collars [Member] | Minimum [Member]  
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]  
Range 0.00%
Oil Costless Collars [Member] | Maximum [Member]  
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]  
Range 21.42%
Natural Gas Costless Collars [Member]  
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]  
Unobservable Input Gas price volatility curve
Weighted Average 16.66%
Fair Value Assets (Liabilities) $ 593,068
Natural Gas Costless Collars [Member] | Minimum [Member]  
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]  
Range 0.00%
Natural Gas Costless Collars [Member] | Maximum [Member]  
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]  
Range 25.72%