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Fair Value Measurements (Summary Of Unobservable Inputs For Level 3 Fair Value Measurements) (Details)
6 Months Ended
Mar. 31, 2018
USD ($)
Oil Costless Collars [Member]  
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]  
Unobservable Input Oil price volatility curve
Weighted Average 16.28%
Fair Value Assets (Liabilities) $ (820,827)
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 31.53%
Natural Gas Costless Collars [Member]  
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]  
Unobservable Input Gas price volatility curve
Weighted Average 11.86%
Fair Value Assets (Liabilities) $ 79,905
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 19.09%