Supplementary Information On Oil, NGL And Natural Gas Reserves (Summary of Capitalized Costs of Oil and Natural Gas Properties and Related Depreciation, Depletion and Amortization) (Details) - USD ($)	Sep. 30, 2017	Sep. 30, 2016
Extractive Industries [Abstract]
Producing properties	$ 434,571,516	$ 434,469,093
Non-producing minerals	7,243,802	7,364,630
Non-producing leasehold	185,125	204,101
Exploratory wells in progress		5,917
Gross capitalized costs	442,000,443	442,043,741
Accumulated depreciation, depletion and amortization	(245,640,247)	(251,004,735)
Net capitalized costs	$ 196,360,196	$ 191,039,006