Condensed Statements of Cash Flows (Unaudited) (USD $)	9 Months Ended
	Jun. 30, 2013		Jun. 30, 2012
Net income	$ 8,240,953		$ 7,188,375
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	17,090,187		13,680,737
Impairment	225,841	[1]	786,724	[1]
Provision for deferred income taxes	2,651,000		1,261,257
Exploration costs	60,827		384,199
Gain from leasing of fee mineral acreage	(538,133)		(6,929,651)
Net gain on sale of assets	(208,750)		(119,794)
Income from partnerships	(470,286)		(355,898)
Distributions received from partnerships	603,249		436,489
Directors' deferred compensation expense	288,745		314,655
Restricted stock awards	541,937		239,858
Cash provided by changes in assets and liabilities:
Oil, NGL and natural gas sales receivables	(3,885,005)		2,645,853
Fair value of derivative contracts	(987,249)		46,468
Refundable production taxes	253,048		78,978
Other current assets	78,889		13,727
Accounts payable	(48,038)		374,076
Income taxes receivable	325,715		354,246
Other non-current assets			308
Income taxes payable	50,854		690,951
Accrued liabilities	(80,570)		(104,279)
Total adjustments	15,952,261		13,798,904
Net cash provided by operating activities	24,193,214		20,987,279
Investing Activities
Capital expenditures, including dry hole costs	(20,576,359)		(16,026,416)
Acquisition of working interest properties			(17,399,052)
Acquisition of minerals and overrides	(783,750)		(2,625,569)
Proceeds from leasing of fee mineral acreage	557,196		7,042,364
Investments in partnerships	(607,702)		(321,640)
Proceeds from sales of assets	870,610		131,843
Net cash used in investing activities	(20,540,005)		(29,198,470)
Financing Activities
Borrowings under debt agreement	9,353,651		33,385,738
Payments of loan principal	(10,663,399)		(25,385,738)
Purchase of treasury stock	(1,214,638)		(1,158,957)
Payments of dividends	(1,746,217)		(1,740,920)
Excess tax benefit on stock-based compensation	15,000		83,743
Net cash provided by (used in) financing activities	(4,255,603)		5,183,866
Increase (decrease) in cash and cash equivalents	(602,394)		(3,027,325)
Cash and cash equivalents at beginning of period	1,984,099		3,506,999
Cash and cash equivalents at end of period	1,381,705		479,674
Supplemental Schedule of Noncash Investing and Financing Activities
Additions to asset retirement obligations	119,166		45,702
Gross additions to properties and equipment	21,660,852		35,945,287
Net (increase) decrease in accounts payable for properties and equipment additions	(300,743)		105,750
Capital expenditures and acquisitions, including dry hole costs	$ 21,360,109		$ 36,051,037

[1] At the end of each quarter, the Company assesses the carrying value of its producing properties for impairment. This assessment utilizes estimates of future net cash flows. Significant judgments and assumptions in these assessments include estimates of future oil and natural gas prices using a forward NYMEX curve adjusted for locational basis differentials, drilling plans, expected capital costs and an applicable discount rate commensurate with risk of the underlying cash flow estimates. These assessments identified certain properties with carrying value in excess of their calculated fair values.