Supplementary Information On Oil, NGL And Natural Gas Reserves (Summary of Standardized Measure of Discounted Future Net Cash Flows) (Details) - USD ($)	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Extractive Industries [Abstract]
Future cash inflows	$ 637,509,599	$ 380,263,695	$ 786,295,155
Future production costs	(256,193,675)	(182,948,045)	(311,933,151)
Future development and asset retirement costs	(93,133,683)	(72,431,842)	(124,857,957)
Future income tax expense	(102,193,819)	(38,674,100)	(123,007,909)
Future net cash flows	185,988,422	86,209,708	226,496,138
10% annual discount	(105,155,847)	(56,439,589)	(144,904,927)
Standardized measure of discounted future net cash flows	$ 80,832,575	$ 29,770,119	$ 81,591,211	$ 204,782,504