Condensed Balance Sheets - USD ($)		Mar. 31, 2018	Sep. 30, 2017
Current assets:
Cash and cash equivalents		$ 168,562	$ 557,791
Oil, NGL and natural gas sales receivables (net of allowance for uncollectable accounts)		6,475,117	7,585,485
Refundable income taxes		792,315	489,945
Assets held for sale			557,750
Derivative contracts, net	[1]		544,924
Other		340,975	253,480
Total current assets		7,776,969	9,989,375
Properties and equipment at cost, based on successful efforts accounting:
Producing oil and natural gas properties		422,574,038	434,571,516
Non-producing oil and natural gas properties		7,399,718	7,428,927
Other		1,510,982	1,067,894
Gross properties and equipment, at cost, based on successful efforts accounting		431,484,738	443,068,337
Less accumulated depreciation, depletion and amortization		(240,207,008)	(246,483,979)
Net properties and equipment		191,277,730	196,584,358
Investments		224,308	170,486
Total assets		199,279,007	206,744,219
Current liabilities:
Accounts payable		785,880	1,847,230
Derivative contracts, net	[1]	1,881,022
Accrued liabilities and other		1,378,284	1,690,789
Total current liabilities		4,045,186	3,538,019
Long-term debt		43,500,000	52,222,000
Deferred income taxes, net		18,280,007	31,051,007
Asset retirement obligations		2,895,355	3,196,889
Derivative contracts, net	[1]	89,337	28,765
Stockholders' equity:
Class A voting common stock, $.0166 par value; 24,000,000 shares authorized, 16,895,603 issued at March 31, 2018, and 16,863,004 issued at September 30, 2017		281,481	280,938
Capital in excess of par value		2,566,003	2,726,444
Deferred directors' compensation		2,819,516	3,459,909
Retained earnings		126,837,723	113,330,216
Stockholders' Equity		132,504,723	119,797,507
Less treasury stock, at cost; 119,650 shares at March 31, 2018, and 184,988 shares at September 30, 2017		(2,035,601)	(3,089,968)
Total stockholders' equity		130,469,122	116,707,539
Total liabilities and stockholders' equity		$ 199,279,007	$ 206,744,219

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