Revenues (Summary Of Disaggregation Of Company's Oil, NGL And Natural Gas Revenues) (Details) - USD ($)	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Disaggregation Of Revenue [Line Items]
Oil, NGL and natural gas sales	$ 7,593,838	$ 12,210,719
Oil [Member]
Disaggregation Of Revenue [Line Items]
Oil, NGL and natural gas sales	3,465,512	4,478,980
NGL [Member]
Disaggregation Of Revenue [Line Items]
Oil, NGL and natural gas sales	614,883	1,454,835
Natural Gas [Member]
Disaggregation Of Revenue [Line Items]
Oil, NGL and natural gas sales	3,513,443	6,276,904
Royalty Interest [Member]
Disaggregation Of Revenue [Line Items]
Oil, NGL and natural gas sales	2,909,101	4,766,441
Royalty Interest [Member] | Oil [Member]
Disaggregation Of Revenue [Line Items]
Oil, NGL and natural gas sales	1,413,211	2,294,102
Royalty Interest [Member] | NGL [Member]
Disaggregation Of Revenue [Line Items]
Oil, NGL and natural gas sales	222,777	441,227
Royalty Interest [Member] | Natural Gas [Member]
Disaggregation Of Revenue [Line Items]
Oil, NGL and natural gas sales	1,273,113	2,031,112
Working Interest [Member]
Disaggregation Of Revenue [Line Items]
Oil, NGL and natural gas sales	4,684,737	7,444,278
Working Interest [Member] | Oil [Member]
Disaggregation Of Revenue [Line Items]
Oil, NGL and natural gas sales	2,052,301	2,184,878
Working Interest [Member] | NGL [Member]
Disaggregation Of Revenue [Line Items]
Oil, NGL and natural gas sales	392,106	1,013,608
Working Interest [Member] | Natural Gas [Member]
Disaggregation Of Revenue [Line Items]
Oil, NGL and natural gas sales	$ 2,240,330	$ 4,245,792