Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
OPERATING REVENUES:
Residential	$ 30,142	$ 29,682	$ 29,079
Commercial and industrial	13,760	13,822	13,267
Other	3,682	3,585	3,554
Operating revenues	47,584	47,089	45,900
OPERATING EXPENSES:
Operation and maintenance	8,031	8,066	7,968
Administrative and general	9,129	9,082	8,812
Depreciation and amortization	6,422	6,151	5,932
Taxes other than income taxes	1,114	1,129	1,111
Operating expenses	24,696	24,428	23,823
Operating income	22,888	22,661	22,077
OTHER INCOME (EXPENSES):
Interest on debt	(5,265)	(5,182)	(5,206)
Allowance for funds used during construction	228	206	210
Gain on sale of land	36	0	316
Other income (expenses), net	(632)	(456)	(1,036)
Other income (expenses)	(5,633)	(5,432)	(5,716)
Income before income taxes	17,255	17,229	16,361
Income taxes	5,409	4,740	4,877
Net Income	$ 11,846	$ 12,489	$ 11,484
Basic Earnings Per Share (in dollars per share)	$ 0.92	$ 0.97	$ 0.89
Diluted Earnings Per Share (in dollars per share)	0.92	0.97	0.89
Cash Dividends Declared Per Share (in shares)	$ 0.6267	$ 0.6040	$ 0.5788