Consolidated Statements of Comprehensive Income (Unaudited) (USD $)	3 Months Ended		6 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2012	Mar. 31, 2011
Income Statement [Abstract]
Utility operating revenues	$ 8,142,667	$ 9,573,487	$ 13,055,962	$ 15,425,271
Natural gas purchased	3,409,252	4,775,857	5,406,366	7,272,905
Gross margin	4,733,415	4,797,630	7,649,596	8,152,366
Cost and expense
Operating and maintenance expense	1,836,562	1,919,394	2,856,974	3,615,888
Taxes other than income taxes	494,228	472,318	963,464	890,236
Depreciation	418,841	326,903	838,592	620,361
Other deductions, net	30,627	31,085	297,204	109,576
Total costs and expenses	2,780,258	2,749,700	4,956,234	5,236,061
Utility operating income	1,953,157	2,047,930	2,693,362	2,916,305
Other income and (expense)
Interest expense	(248,761)	(245,037)	(500,120)	(453,679)
Non-utility expense	(625)	(2,683)	(1,800)	(5,453)
Other income	24,616	649	289,892	11,352
Investment income	48,698	11,045	73,016	155,004
Rental income	12,138	12,138	24,276	24,276
Net income from utility operations, before income tax	1,789,223	1,824,042	2,578,626	2,647,805
Income tax benefit (expense), current	(448,274)	(775,042)	(210,843)	(817,409)
Income tax benefit (expense), deferred	(203,792)	119,859	(819,822)	(149,131)
Total tax (expense)	(652,066)	(655,183)	(1,030,665)	(966,540)
Net income	1,137,157	1,168,859	1,547,961	1,681,265
Other comprehensive (loss)
Pension adjustment, net of tax	(106,488)	(124,598)	(304,152)	(249,197)
Net unrealized gain (loss) on securities available for sale	69,869	30,042	131,355	(9,067)
Total other comprehensive (loss)	(36,619)	(94,556)	(172,797)	(258,264)
Total comprehensive income	$ 1,100,538	$ 1,074,303	$ 1,375,164	$ 1,423,001
Weighted average earnings per share
basic:	$ 0.58	$ 0.67	$ 0.82	$ 0.97
diluted:	$ 0.57	$ 0.66	$ 0.81	$ 0.96
Average shares outstanding - basic	1,968,568	1,740,500	1,892,101	1,731,018
Average shares outstanding - diluted	1,981,379	1,759,407	1,905,948	1,747,800