Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
OPERATING REVENUES:
Residential	$ 26,114	$ 25,693	$ 24,478
Commercial and industrial	12,114	11,820	11,440
Other	3,219	3,116	3,087
Operating revenues	41,447	40,629	39,005
OPERATING EXPENSES:
Operation and maintenance	7,221	7,333	6,760
Administrative and general	7,303	7,309	6,725
Depreciation and amortization	5,170	4,905	4,592
Taxes other than income taxes	1,180	1,207	1,161
Operating expenses	20,874	20,754	19,238
Operating income	20,573	19,875	19,767
OTHER INCOME (EXPENSES):
Interest on debt	(5,249)	(5,254)	(4,906)
Allowance for funds used during construction	105	99	111
Other income (expenses), net	(520)	(677)	(465)
Other income (expenses)	(5,664)	(5,832)	(5,260)
Income before income taxes	14,909	14,043	14,507
Income taxes	5,606	4,959	5,578
Net Income	$ 9,303	$ 9,084	$ 8,929
Basic Earnings Per Share (in dollars per share)	$ 0.72	$ 0.71	$ 0.71
Cash Dividends Declared Per Share (in shares)	$ 0.5391	$ 0.5266	$ 0.5150