Condensed Statements Of Cash Flows - USD ($)	9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Operating Activities
Net income (loss)	$ 15,408,842	$ 14,080,022
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, depletion and amortization	11,820,705	14,136,411
Provision for deferred income taxes	5,150,000	(12,947,000)
Gain from leasing fee mineral acreage	(951,832)	(1,079,803)
Proceeds from leasing fee mineral acreage	967,337	1,102,818
Net (gain) loss on sales of assets	(13,114,725)	660,597
Directors' deferred compensation expense	197,820	233,573
Fair value of derivative contracts	(6,125,525)	3,819,639
Restricted stock awards	606,232	501,626
Other	15,848	5,113
Cash provided (used) by changes in assets and liabilities:
Oil, NGL and natural gas sales receivables	1,597,667	1,095,996
Other current assets	(859,258)	77,124
Accounts payable	3,270	(125,261)
Income taxes receivable	(476,846)	279,975
Other non-current assets	6,949	(52,644)
Accrued liabilities	86,467	(130,284)
Total adjustments	(1,075,891)	7,577,880
Net cash provided by operating activities	14,332,951	21,657,902
Investing Activities
Capital expenditures	(3,349,640)	(7,743,097)
Acquisition of minerals and overrides	(5,120,466)	(966,279)
Investments in partnerships	(1,648)	3,379
Proceeds from sales of assets	13,114,969	1,085,137
Net cash provided (used) by investing activities	4,643,215	(7,620,860)
Financing Activities
Borrowings under debt agreement	15,053,345	13,529,879
Payments of loan principal	(24,553,345)	(25,352,099)
Purchases of treasury stock	(6,465,186)	(272,100)
Payments of dividends	(2,013,005)	(2,023,500)
Net cash provided (used) by financing activities	(17,978,191)	(14,117,820)
Increase (decrease) in cash and cash equivalents	997,975	(80,778)
Cash and cash equivalents at beginning of period	532,502	557,791
Cash and cash equivalents at end of period	1,530,477	477,013
Supplemental Schedule of Noncash Investing and Financing Activities:
Additions to asset retirement obligations	27,782	15,452
Gross additions to properties and equipment	8,149,347	8,150,830
Net (increase) decrease in accounts payable for properties and equipment additions	320,759	558,546
Capital expenditures and acquisitions	$ 8,470,106	$ 8,709,376