Consolidated Balance Sheets (Parenthetical) (USD $)	Jun. 30, 2012	Sep. 30, 2011	Jun. 30, 2011
Current assets
Allowance for uncollectible accounts	$ 79,933	$ 46,080	$ 32,634
Regulatory assets
Accumulated amortization of debt issuance cost	$ 477,861	$ 443,854	$ 431,839
Common stockholders' equity
Common stock, par value	$ 5.00	$ 5.00	$ 5.00
Commn stock, authorized shares	3,500,000	3,500,000	3,500,000
Common stock, shares outstanding	1,972,193	1,787,769	1,748,582
Common stock, shares issued	1,972,193	1,787,769	1,748,582