Revenues (Summary Of Disaggregation Of Company's Oil, NGL And Natural Gas Revenues) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Disaggregation Of Revenue [Line Items]
Oil, NGL and natural gas sales	$ 7,982,905	$ 9,221,319	$ 15,576,743	$ 21,432,038
Royalty Interest [Member]
Disaggregation Of Revenue [Line Items]
Oil, NGL and natural gas sales	4,567,856	3,150,418	7,476,958	7,926,562
Working Interest [Member]
Disaggregation Of Revenue [Line Items]
Oil, NGL and natural gas sales	3,415,049	6,070,901	8,099,785	13,505,476
Oil [Member]
Disaggregation Of Revenue [Line Items]
Oil, NGL and natural gas sales	4,767,775	3,929,605	8,233,287	8,408,585
Oil [Member] | Royalty Interest [Member]
Disaggregation Of Revenue [Line Items]
Oil, NGL and natural gas sales	3,126,132	1,552,380	4,539,343	3,856,185
Oil [Member] | Working Interest [Member]
Disaggregation Of Revenue [Line Items]
Oil, NGL and natural gas sales	1,641,643	2,377,225	3,693,944	4,552,400
NGL [Member]
Disaggregation Of Revenue [Line Items]
Oil, NGL and natural gas sales	524,741	816,362	1,139,624	2,271,197
NGL [Member] | Royalty Interest [Member]
Disaggregation Of Revenue [Line Items]
Oil, NGL and natural gas sales	196,311	186,884	419,088	628,111
NGL [Member] | Working Interest [Member]
Disaggregation Of Revenue [Line Items]
Oil, NGL and natural gas sales	328,430	629,478	720,536	1,643,086
Natural Gas [Member]
Disaggregation Of Revenue [Line Items]
Oil, NGL and natural gas sales	2,690,389	4,475,352	6,203,832	10,752,256
Natural Gas [Member] | Royalty Interest [Member]
Disaggregation Of Revenue [Line Items]
Oil, NGL and natural gas sales	1,245,413	1,411,154	2,518,527	3,442,266
Natural Gas [Member] | Working Interest [Member]
Disaggregation Of Revenue [Line Items]
Oil, NGL and natural gas sales	$ 1,444,976	$ 3,064,198	$ 3,685,305	$ 7,309,990