Condensed Statements Of Cash Flows - USD ($)	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Operating Activities
Net income (loss)	$ 1,892,114	$ 12,735,940
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, depletion and amortization	2,955,701	3,813,686
Provision for deferred income taxes	658,000	4,314,000
Gain from leasing fee mineral acreage	(523,384)	(514,557)
Proceeds from leasing fee mineral acreage	537,777	528,374
Net (gain) loss on sales of assets	(3,272,888)	(9,096,938)
Directors' deferred compensation expense	86,213	80,287
Fair value of derivative contracts	1,719,667	(6,206,181)
Restricted stock awards	148,515	159,469
Other	8,896	7,163
Cash provided (used) by changes in assets and liabilities:
Oil, NGL and natural gas sales receivables	56,160	(77,414)
Other current assets	(407,610)	(261,308)
Accounts payable	(73,831)	(2,971)
Income taxes receivable	(412,073)	(754,153)
Other non-current assets	1,090	28,899
Accrued liabilities	(1,275,906)	(744,553)
Total adjustments	206,327	(8,726,197)
Net cash provided by operating activities	2,098,441	4,009,743
Investing Activities
Capital expenditures	(105,265)	(1,445,939)
Acquisition of minerals and overrides	(10,172,594)	(423,000)
Proceeds from sales of assets	3,376,049	9,096,938
Net cash provided (used) by investing activities	(6,901,810)	7,227,999
Financing Activities
Borrowings under debt agreement	4,774,297	3,832,557
Payments of loan principal	(5,199,297)	(13,332,557)
Purchases of treasury stock	(7,635)	(1,140,559)
Payments of dividends	(655,980)	(673,892)
Net cash provided (used) by financing activities	(1,088,615)	(11,314,451)
Increase (decrease) in cash and cash equivalents	(5,891,984)	(76,709)
Cash and cash equivalents at beginning of period	6,160,691	532,502
Cash and cash equivalents at end of period	268,707	455,793
Supplemental Schedule of Noncash Investing and Financing Activities:
Dividends declared and unpaid	663,919	673,897
Additions to asset retirement obligations	4	5,371
Gross additions to properties and equipment	10,164,680	1,894,741
Net (increase) decrease in accounts payable for properties and equipment additions	113,179	(25,802)
Capital expenditures and acquisitions	$ 10,277,859	$ 1,868,939