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, 2018	Sep. 30, 2017
Extractive Industries [Abstract]
Producing properties	$ 427,448,584	$ 434,571,516
Non-producing minerals	12,378,395	7,243,802
Non-producing leasehold	185,124	185,125
Gross capitalized costs	440,012,103	442,000,443
Accumulated depreciation, depletion and amortization	(242,169,604)	(245,640,247)
Net capitalized costs	$ 197,842,499	$ 196,360,196