Revenues (Summary Of Disaggregation Of Company's Oil, NGL And Natural Gas Revenues) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation Of Revenue [Line Items]
Oil, NGL and natural gas sales	$ 3,517,561	$ 9,782,337	$ 18,329,017	$ 31,214,375
Royalty Interest [Member]
Disaggregation Of Revenue [Line Items]
Oil, NGL and natural gas sales	1,641,072	3,123,100	8,352,743	11,049,662
Working Interest [Member]
Disaggregation Of Revenue [Line Items]
Oil, NGL and natural gas sales	1,876,489	6,659,237	9,976,274	20,164,713
Oil [Member]
Disaggregation Of Revenue [Line Items]
Oil, NGL and natural gas sales	1,430,017	5,523,467	9,085,820	13,932,052
Oil [Member] | Royalty Interest [Member]
Disaggregation Of Revenue [Line Items]
Oil, NGL and natural gas sales	719,012	1,640,247	4,680,871	5,496,433
Oil [Member] | Working Interest [Member]
Disaggregation Of Revenue [Line Items]
Oil, NGL and natural gas sales	711,005	3,883,220	4,404,949	8,435,619
NGL [Member]
Disaggregation Of Revenue [Line Items]
Oil, NGL and natural gas sales	232,856	826,282	1,372,480	3,097,479
NGL [Member] | Royalty Interest [Member]
Disaggregation Of Revenue [Line Items]
Oil, NGL and natural gas sales	129,833	310,581	548,921	938,692
NGL [Member] | Working Interest [Member]
Disaggregation Of Revenue [Line Items]
Oil, NGL and natural gas sales	103,023	515,701	823,559	2,158,787
Natural Gas [Member]
Disaggregation Of Revenue [Line Items]
Oil, NGL and natural gas sales	1,854,688	3,432,588	7,870,717	14,184,844
Natural Gas [Member] | Royalty Interest [Member]
Disaggregation Of Revenue [Line Items]
Oil, NGL and natural gas sales	792,227	1,172,272	3,122,951	4,614,537
Natural Gas [Member] | Working Interest [Member]
Disaggregation Of Revenue [Line Items]
Oil, NGL and natural gas sales	$ 1,062,461	$ 2,260,316	$ 4,747,766	$ 9,570,307