Condensed Consolidated Statements of Income (USD $)	12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Income Statement [Abstract]
Utility operating revenues	$ 22,827,862	$ 22,445,300	$ 23,697,031
Natural gas purchased	9,714,941	9,647,495	13,034,734
Gross margin	13,112,921	12,797,805	10,662,297
Cost and expense
Operating and maintenance expense	7,280,393	6,874,009	6,594,934
Taxes other than income taxes	1,914,658	1,673,868	1,521,906
Depreciation	1,478,953	713,066	762,197
Other deductions, net	216,271	144,360	120,442
Total costs and expenses	10,890,275	9,405,303	8,999,479
Utility operating income	2,222,646	3,392,502	1,662,818
Other income and (expense)
Interest expense	(897,437)	(925,999)	(905,658)
Non-utility expense	(9,570)	(27,570)	(12,041)
Investment income (expense)	181,542	120,641	(49,439)
Other income	33,129	6,809	139,998
Rental income	48,552	48,552	51,281
Net income from utility operations, before income tax	1,578,862	2,614,935	886,959
Income tax benefit (expense), current	54,139	(1,114,034)	1,555,010
Income tax benefit (expense), deferred	(284,173)	140,722	(1,769,684)
Total tax (expense)	(230,034)	(973,312)	(214,674)
Net income	1,348,828	1,641,623	672,285
Other comprehensive income (loss)	(453,344)	716,833	(1,916,829)
Total comprehensive income (loss)	$ 895,484	$ 2,358,456	$ (1,244,544)
Weighted average earnings per share
basic:	$ 0.77	$ 1.05	$ 0.53
diluted:	$ 0.76	$ 1.05	$ 0.52
Average shares outstanding - basic	1,746,198	1,562,576	1,280,285
Average shares outstanding - diluted	1,765,220	1,570,902	1,284,900