Income Taxes (Details1) (USD $)	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2010
Income Taxes Details1
Unbilled revenue	$ 36,637				$ 42,187
Deferred compensation reserve	554,728		810,617		900,339
Post-retirement benefit obligations	439,234		317,329		339,462
Comprehensive income	2,528,780		2,367,781		2,473,850
Inventories	45,308
Estimated tax payments	68,242		1,332,039		26,888
Prior period tax reconciliations (1)(2)(3)	227,971	[1],[2],[3]	687,570	[1],[2],[3]	468,078	[1],[2],[3]
Other	1,715,363		855,783		603,756
Total deferred income tax assets	5,616,263		6,371,119		4,854,560
Property, plant and equipment, principally due to differences in depreciation	1,418,210		2,591,119		2,561,750
Pension benefit obligations	1,659,791		1,290,001		1,057,256
Unbilled revenue			39,893
Inventories			60,795		64,277
Deferred rate expense and allocations	663,673		583,994		645,196
Deficiency of gas adjustment clause revenues billed	397,687		236,923		373,905
Other	371,957		407,875		542,465
Total deferred income tax liabilities	4,511,318		5,210,600		5,244,849
Net deferred income tax (assets) liabilities	$ (1,104,945)		$ (1,160,519)		$ 390,289

[1] In 2010, this amount is the total of $601,407 for tax depreciation less $133,329 for deferred taxes from prior period reconciliation.

[2] In 2011, this amount is the total of $224,073 for tax depreciation less $5,258 for deferred taxes plus $468,755 for prior period accrued income taxes.

[3] In 2012, this amount is the total of $652,404 for tax depreciation less $561,952 for deferred taxes plus $137,519 for prior period accrued income taxes