Condensed Balance Sheets - USD ($)		Jun. 30, 2019	Sep. 30, 2018
Current assets:
Cash and cash equivalents		$ 1,530,477	$ 532,502
Oil, NGL and natural gas sales receivables (net of allowance for uncollectable accounts)		5,503,962	7,101,629
Refundable income taxes		510,011	33,165
Derivative contracts, net	[1]	2,489,373
Other		1,438,138	578,880
Total current assets		11,471,961	8,246,176
Properties and equipment at cost, based on successful efforts accounting:
Producing oil and natural gas properties		435,425,936	427,448,584
Non-producing oil and natural gas properties		12,518,885	12,563,519
Other		1,717,769	1,529,770
Gross properties and equipment, at cost, based on successful efforts accounting		449,662,590	441,541,873
Less accumulated depreciation, depletion and amortization		(254,954,381)	(243,257,472)
Net properties and equipment		194,708,209	198,284,401
Investments		207,225	219,109
Derivative contracts, net	[1]	222,136
Total assets		206,609,531	206,749,686
Current liabilities:
Accounts payable		563,642	881,130
Derivative contracts, net	[1]		3,064,046
Accrued liabilities and other		1,880,199	1,791,950
Total current liabilities		2,443,841	5,737,126
Long-term debt		41,500,000	51,000,000
Deferred income taxes, net		23,238,007	18,088,007
Asset retirement obligations		2,927,487	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 June 30, 2019, and 16,896,881 issued at September 30, 2018		281,509	281,502
Capital in excess of par value		2,937,874	2,824,691
Deferred directors' compensation		2,481,109	2,950,405
Retained earnings		138,662,782	125,266,945
Stockholders' Equity		144,363,274	131,323,543
Less treasury stock, at cost; 508,582 shares at June 30, 2019, and 145,467 shares at September 30, 2018		(7,863,078)	(2,558,338)
Total stockholders' equity		136,500,196	128,765,205
Total liabilities and stockholders' equity		$ 206,609,531	$ 206,749,686

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