Condensed Statements Of Cash Flows - USD ($)	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Operating Activities
Net income (loss)	$ 12,735,940	$ 13,784,939
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, depletion and amortization	3,813,686	5,275,824
Provision for deferred income taxes	4,314,000	(12,738,000)
Gain from leasing fee mineral acreage	(514,557)	(96,843)
Proceeds from leasing fee mineral acreage	528,374	98,692
Net (gain) loss on sales of assets	(9,096,938)	272,236
Directors' deferred compensation expense	80,287	108,384
Fair value of derivative contracts	(6,206,181)	851,036
Restricted stock awards	159,469	194,050
Other	7,163	(3,237)
Cash provided (used) by changes in assets and liabilities:
Oil, NGL and natural gas sales receivables	(77,414)	229,701
Other current assets	(261,308)	(59,253)
Accounts payable	(2,971)	(86,404)
Income taxes receivable	(754,153)	24,574
Other non-current assets	28,899	(79,552)
Accrued liabilities	(744,553)	(577,564)
Total adjustments	(8,726,197)	(6,586,356)
Net cash provided by operating activities	4,009,743	7,198,583
Investing Activities
Capital expenditures	(1,445,939)	(4,984,880)
Acquisition of minerals and overrides	(423,000)
Investments in partnerships		5,393
Proceeds from sales of assets	9,096,938	557,750
Net cash provided (used) by investing activities	7,227,999	(4,421,737)
Financing Activities
Borrowings under debt agreement	3,832,557	8,272,575
Payments of loan principal	(13,332,557)	(10,094,795)
Purchases of treasury stock	(1,140,559)	(272,100)
Payments of dividends	(673,892)	(671,890)
Net cash provided (used) by financing activities	(11,314,451)	(2,766,210)
Increase (decrease) in cash and cash equivalents	(76,709)	10,636
Cash and cash equivalents at beginning of period	532,502	557,791
Cash and cash equivalents at end of period	455,793	568,427
Supplemental Schedule of Noncash Investing and Financing Activities:
Dividends declared and unpaid	673,897	675,718
Additions to asset retirement obligations	5,371	12,026
Gross additions to properties and equipment	1,894,741	4,287,096
Net (increase) decrease in accounts payable for properties and equipment additions	(25,802)	697,784
Capital expenditures and acquisitions	$ 1,868,939	$ 4,984,880