Condensed Balance Sheets - USD ($)		Jun. 30, 2018	Sep. 30, 2017
Current assets:
Cash and cash equivalents		$ 477,013	$ 557,791
Oil, NGL and natural gas sales receivables (net of allowance for uncollectable accounts)		6,489,489	7,585,485
Refundable income taxes		209,970	489,945
Assets held for sale			557,750
Derivative contracts, net	[1]		544,924
Other		176,356	253,480
Total current assets		7,352,828	9,989,375
Properties and equipment at cost, based on successful efforts accounting:
Producing oil and natural gas properties		418,338,755	434,571,516
Non-producing oil and natural gas properties		8,170,286	7,428,927
Other		1,515,076	1,067,894
Gross properties and equipment, at cost, based on successful efforts accounting		428,024,117	443,068,337
Less accumulated depreciation, depletion and amortization		(239,052,685)	(246,483,979)
Net properties and equipment		188,971,432	196,584,358
Investments		212,068	170,486
Total assets		196,536,328	206,744,219
Current liabilities:
Accounts payable		1,163,424	1,847,230
Derivative contracts, net	[1]	3,014,511
Accrued liabilities and other		1,554,645	1,690,789
Total current liabilities		5,732,580	3,538,019
Long-term debt		40,400,000	52,222,000
Deferred income taxes, net		18,104,007	31,051,007
Asset retirement obligations		2,776,058	3,196,889
Derivative contracts, net	[1]	288,969	28,765
Stockholders' equity:
Class A voting common stock, $.0166 par value; 24,000,000 shares authorized, 16,896,455 issued at June 30, 2018, and 16,863,004 issued at September 30, 2017		281,495	280,938
Capital in excess of par value		2,690,834	2,726,444
Deferred directors' compensation		2,882,263	3,459,909
Retained earnings		125,386,738	113,330,216
Stockholders' Equity		131,241,330	119,797,507
Less treasury stock, at cost; 117,946 shares at June 30, 2018, and 184,988 shares at September 30, 2017		(2,006,616)	(3,089,968)
Total stockholders' equity		129,234,714	116,707,539
Total liabilities and stockholders' equity		$ 196,536,328	$ 206,744,219

[1] See Fair Value Measurements section for further disclosures regarding fair value of financial instruments.