Fair Value Measurements (Summary Of Impairments Associated With Certain Assets Measured At Fair Value On A Nonrecurring Basis Within Level 3) (Details) - USD ($)		3 Months Ended	9 Months Ended
		Jun. 30, 2019	Jun. 30, 2020		Jun. 30, 2019
Fair Value Disclosures [Abstract]
Producing Properties, Fair Value	[1]		$ 5,288,710
Producing Properties, Impairment		$ 0	$ 29,315,807	[1]	$ 0

[1] When indicators of impairment are present, the Company assesses the carrying value of its producing properties for impairment. This assessment utilized estimates of future cash flows. Significant judgments and assumptions in these assessments include estimates of future oil, NGL and natural gas prices using a forward NYMEX curve adjusted for projected inflation, locational basis differentials, drilling plans, expected capital costs and an applicable discount rate commensurate with risk of the underlying cash flow estimates. These assessments identified certain properties with carrying value in excess of their calculated fair values. This table excludes impairments on properties that were written off during the three and nine months ended June 30, 2020, in the amounts of $358,826 and $588,721, respectively.