Condensed Balance Sheets - USD ($)		Jun. 30, 2017	Sep. 30, 2016
Current assets:
Cash and cash equivalents		$ 560,892	$ 471,213
Oil, NGL and natural gas sales receivables (net of allowance for uncollectable accounts)		5,851,996	5,287,229
Refundable income taxes		571,986	83,874
Derivative contracts, net	[1]	1,439,686
Other		222,675	419,037
Total current assets		8,647,235	6,261,353
Properties and equipment at cost, based on successful efforts accounting:
Producing oil and natural gas properties		443,928,828	434,469,093
Non-producing oil and natural gas properties		7,462,082	7,574,649
Other		1,064,172	1,069,658
Gross properties and equipment, at cost, based on successful efforts accounting		452,455,082	443,113,400
Less accumulated depreciation, depletion and amortization		(255,806,129)	(251,707,749)
Net properties and equipment		196,648,953	191,405,651
Investments		168,209	157,322
Derivative contracts, net	[1]	11,711
Total assets		205,476,108	197,824,326
Current liabilities:
Accounts payable		3,791,830	2,351,623
Derivative contracts, net	[1]		403,612
Accrued liabilities and other		1,758,153	1,718,558
Total current liabilities		5,549,983	4,473,793
Long-term debt		50,000,000	44,500,000
Deferred income taxes, net		30,825,007	30,676,007
Asset retirement obligations		3,114,867	2,958,048
Derivative contracts, net	[1]		24,659
Stockholders' equity:
Class A voting common stock, $.0166 par value; 24,000,000 shares authorized, 16,863,004 issued at June 30, 2017, and September 30, 2016		280,938	280,938
Capital in excess of par value		2,531,822	3,191,056
Deferred directors' compensation		3,367,432	3,403,213
Retained earnings		112,962,754	112,482,284
Stockholders' Equity		119,142,946	119,357,491
Less treasury stock, at cost; 191,988 shares at June 30, 2017, and 262,708 shares at September 30, 2016		(3,156,695)	(4,165,672)
Total stockholders' equity		115,986,251	115,191,819
Total liabilities and stockholders' equity		$ 205,476,108	$ 197,824,326

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