Condensed Balance Sheets - USD ($)		Mar. 31, 2019	Sep. 30, 2018
Current assets:
Cash and cash equivalents		$ 504,982	$ 532,502
Oil, NGL and natural gas sales receivables (net of allowance for uncollectable accounts)		6,385,694	7,101,629
Refundable income taxes		571,315	33,165
Derivative contracts, net	[1]	715,223
Other		751,525	578,880
Total current assets		8,928,739	8,246,176
Properties and equipment at cost, based on successful efforts accounting:
Producing oil and natural gas properties		432,969,755	427,448,584
Non-producing oil and natural gas properties		12,521,442	12,563,519
Other		1,686,490	1,529,770
Gross properties and equipment, at cost, based on successful efforts accounting		447,177,687	441,541,873
Less accumulated depreciation, depletion and amortization		(250,606,416)	(243,257,472)
Net properties and equipment		196,571,271	198,284,401
Investments		197,340	219,109
Derivative contracts, net	[1]	101,983
Total assets		205,799,333	206,749,686
Current liabilities:
Accounts payable		487,756	881,130
Derivative contracts, net	[1]		3,064,046
Accrued liabilities and other		1,451,427	1,791,950
Total current liabilities		1,939,183	5,737,126
Long-term debt		44,100,000	51,000,000
Deferred income taxes, net		22,030,007	18,088,007
Asset retirement obligations		2,897,354	2,809,378
Derivative contracts, net	[1]		349,970
Stockholders' equity:
Class A voting common stock, $0.0166 par value; 24,000,000 shares authorized, 16,897,306 issued at March 31, 2019, and 16,896,881 issued at September 30, 2018		281,509	281,502
Capital in excess of par value		2,830,224	2,824,691
Deferred directors' compensation		2,415,569	2,950,405
Retained earnings		134,723,381	125,266,945
Stockholders' Equity		140,250,683	131,323,543
Less treasury stock, at cost; 329,065 shares at March 31, 2019, and 145,467 shares at September 30, 2018		(5,417,894)	(2,558,338)
Total stockholders' equity		134,832,789	128,765,205
Total liabilities and stockholders' equity		$ 205,799,333	$ 206,749,686

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