Revenues (Summary of Disaggregation of Company's Natural Gas, Oil and NGL Revenues) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Disaggregation Of Revenue [Line Items]
Natural gas, oil and NGL sales	$ 8,345,825	$ 7,217,618	$ 14,770,804	$ 14,811,456
Royalty Interest [Member]
Disaggregation Of Revenue [Line Items]
Natural gas, oil and NGL sales	4,494,347	3,802,569	7,011,802	6,711,671
Working Interest [Member]
Disaggregation Of Revenue [Line Items]
Natural gas, oil and NGL sales	3,851,478	3,415,049	7,759,002	8,099,785
Oil [Member]
Disaggregation Of Revenue [Line Items]
Natural gas, oil and NGL sales	3,144,921	4,190,291	5,485,987	7,655,803
Oil [Member] | Royalty Interest [Member]
Disaggregation Of Revenue [Line Items]
Natural gas, oil and NGL sales	1,717,069	2,548,648	2,814,021	3,961,859
Oil [Member] | Working Interest [Member]
Disaggregation Of Revenue [Line Items]
Natural gas, oil and NGL sales	1,427,852	1,641,643	2,671,966	3,693,944
NGL [Member]
Disaggregation Of Revenue [Line Items]
Natural gas, oil and NGL sales	827,807	524,741	1,452,919	1,139,624
NGL [Member] | Royalty Interest [Member]
Disaggregation Of Revenue [Line Items]
Natural gas, oil and NGL sales	410,851	196,311	641,189	419,088
NGL [Member] | Working Interest [Member]
Disaggregation Of Revenue [Line Items]
Natural gas, oil and NGL sales	416,956	328,430	811,730	720,536
Natural Gas [Member]
Disaggregation Of Revenue [Line Items]
Natural gas, oil and NGL sales	4,373,097	2,502,586	7,831,898	6,016,029
Natural Gas [Member] | Royalty Interest [Member]
Disaggregation Of Revenue [Line Items]
Natural gas, oil and NGL sales	2,366,427	1,057,610	3,556,592	2,330,724
Natural Gas [Member] | Working Interest [Member]
Disaggregation Of Revenue [Line Items]
Natural gas, oil and NGL sales	$ 2,006,670	$ 1,444,976	$ 4,275,306	$ 3,685,305