Supplementary Information On Oil, NGL And Natural Gas Reserves (Summary of Standardized Measure of Discounted Future Net Cash Flows) (Details) - USD ($)	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Extractive Industries [Abstract]
Future cash inflows	$ 759,899,074	$ 637,509,599	$ 380,263,695
Future production costs	(259,413,766)	(256,193,675)	(182,948,045)
Future development and asset retirement costs	(89,518,449)	(93,133,683)	(72,431,842)
Future income tax expense	(95,872,182)	(102,193,819)	(38,674,100)
Future net cash flows	315,094,677	185,988,422	86,209,708
10% annual discount	(158,768,823)	(105,155,847)	(56,439,589)
Standardized measure of discounted future net cash flows	$ 156,325,854	$ 80,832,575	$ 29,770,119	$ 81,591,211