Condensed Statements Of Cash Flows - USD ($)	3 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Operating Activities
Net income (loss)	$ 13,784,939	$ (2,238,392)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, depletion and amortization	5,275,824	4,834,263
Provision for deferred income taxes	(12,738,000)	(1,107,000)
Gain from leasing fee mineral acreage	(96,843)	(837,732)
Proceeds from leasing fee mineral acreage	98,692	847,578
Net (gain) loss on sales of assets	272,236
Directors' deferred compensation expense	108,384	105,818
Restricted stock awards	194,050	180,412
Other	(3,237)	298
Cash provided (used) by changes in assets and liabilities:
Oil, NGL and natural gas sales receivables	229,701	(239,558)
Fair value of derivative contracts	851,036	2,516,263
Other current assets	(59,253)	145,640
Accounts payable	(86,404)	(90,474)
Income taxes receivable	24,574	(14,166)
Other non-current assets	(79,552)
Accrued liabilities	(577,564)	(419,299)
Total adjustments	(6,586,356)	5,922,043
Net cash provided by operating activities	7,198,583	3,683,651
Investing Activities
Capital expenditures	(4,984,880)	(2,174,523)
Investments in partnerships	5,393	(17,571)
Proceeds from sales of assets	557,750
Net cash provided (used) by investing activities	(4,421,737)	(2,192,094)
Financing Activities
Borrowings under debt agreement	8,272,575	4,436,304
Payments of loan principal	(10,094,795)	(4,836,304)
Purchases of treasury stock	(272,100)	(407,677)
Payments of dividends	(671,890)	(670,104)
Net cash provided (used) by financing activities	(2,766,210)	(1,477,781)
Increase (decrease) in cash and cash equivalents	10,636	13,776
Cash and cash equivalents at beginning of period	557,791	471,213
Cash and cash equivalents at end of period	568,427	484,989
Supplemental Schedule of Noncash Investing and Financing Activities:
Dividends declared and unpaid	675,718	670,255
Additions to asset retirement obligations	12,026	594
Gross additions to properties and equipment	4,287,096	3,370,574
Net (increase) decrease in accounts payable for properties and equipment additions	697,784	(1,196,051)
Capital expenditures and acquisitions	$ 4,984,880	$ 2,174,523