Consolidated Statements of Income and Comprehensive Income (USD $)	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Income Statement [Abstract]
Utility operating revenues	$ 19,436,916	$ 22,827,862	$ 22,445,300
Natural gas purchased	6,782,544	9,714,941	9,647,495
Gross margin	12,654,372	13,112,921	12,797,805
Cost and expense
Operating and maintenance expense	6,480,927	7,280,393	6,874,009
Taxes other than income taxes	1,958,147	1,914,658	1,673,868
Depreciation	1,698,458	1,478,953	713,066
Other deductions, net	428,115	216,271	144,360
Total costs and expenses	10,565,647	10,890,275	9,405,303
Utility operating income	2,088,725	2,222,646	3,392,502
Other income and (expense)
Interest expense	(974,018)	(897,437)	(925,999)
Non-utility expense	(14,475)	(9,570)	(27,570)
Investment income (expense)	121,099	181,542	120,641
Non-utility income from joint venture	238,193
Other income	289,819	33,129	6,809
Rental income	48,552	48,552	48,552
Net income, before income tax	1,797,895	1,578,862	2,614,935
Income tax benefit (expense), current	1,233,575	54,139	(1,114,034)
Income tax benefit (expense), deferred	(1,679,909)	(284,173)	140,722
Total tax (expense)	(446,334)	(230,034)	(973,312)
Net income	1,351,561	1,348,828	1,641,623
Other comprehensive income (loss)
Pension adjustment, net of tax	(695,101)	(321,993)	679,023
Net unrealized gain (loss) on securities available for sale	141,822	(131,351)	37,810
Total other comprehensive (loss)	(553,279)	(453,344)	716,833
Total comprehensive income	$ 798,282	$ 895,484	$ 2,358,456
Weighted average earnings per share
Basic:	$ 0.69	$ 0.77	$ 1.05
Diluted:	$ 0.69	$ 0.76	$ 1.05
Average shares outstanding - basic	1,953,079	1,746,198	1,562,576
Average shares outstanding - diluted	1,965,761	1,765,220	1,570,902