Summary Of Significant Accounting Policies (Narrative) (Details)	3 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2017	Sep. 30, 2018 USD ($) a Item $ / a	Sep. 30, 2018 USD ($) a Item $ / a	Sep. 30, 2017 USD ($)		Sep. 30, 2016 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Number of Oil, NGL and Natural Gas Production Units | Item		6,079	6,079
Oil, NGL and natural gas revenues were derived from the sale of natural gas			45.00%
Amount of Material Natural Gas Imbalances		$ 0	$ 0	$ 0
Bad debt expense			0	0		$ 0
Outstanding letters of credit		0	0
Fair value of derivative contracts, asset				516,159
Fair value of derivative contracts, liability		3,414,016	3,414,016
Net cash paid on derivatives settled			1,001,893
Net cash received on derivatives settled				305,410		4,552,680
Book value of Non-producing oil and natural gas		$ 8,025,015	$ 8,025,015	$ 3,079,008
Percentage of perpetual ownership of mineral interests in Arkansas ,New Mexico, North Dakota, Oklahoma and Texas		91.00%	91.00%
Accumulated period perpetual rights				92 years
Non Producing Minerals Area | a		198,360	198,360
Number of tracts owned | Item		6,749	6,749
Amount of acres average tract contains | a		29	29
Tracts Average Cost Per Acre | $ / a		62	62
Amortized Period of Non-producing Minerals				33 years
Impairment			$ 0	$ 662,990	[1]	12,001,271	[1]
Number of non-core marginal wells sold | Item			324
Proceeds from sales of assets			$ 1,085,137	723,700		4,501,726
Loss on sale of assets			660,597	94,889		(2,688,408)
Decrease in net book value			1,700,000
Amount of Capitalized Interest Included in the Company's Capital Expenditures			89,023	168,351		24,929
Interest Expense			$ 1,748,101	$ 1,275,138		$ 1,344,619
U.S. federal corporate tax rate	35.00%	21.00%	24.53%
Remeasurement of deferred income tax benefit, amount			$ 12,464,000
Federal tax benefit resulting from the use of blend rate versus old rate			$ 198,581
Effective tax rate			(672.00%)	16.00%
Oklahoma [Member]
Summary Of Significant Accounting Policies [Line Items]
Mineral acreage acquired | a			4,306
Purchase price of mineral acreage acquired			$ 11,300,000
Net mineral price per acre | $ / a		2,600	2,600
Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Useful life of furniture and fixtures			5 years
Restricted Stock Awards, vesting period			3 years
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Useful life of furniture and fixtures			8 years
Sales Revenue, Net [Member] | Product Concentration Risk [Member]
Summary Of Significant Accounting Policies [Line Items]
Total sale volume from sale of natural gas			71.00%

[1] At the end of each quarter, the Company assessed the carrying value of its producing properties for impairment. This assessment utilized estimates of future cash flows or fair value (selling price) less cost to sell if the property is held for sale. 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.