Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
OPERATING REVENUES:
Residential	$ 31,184	$ 30,142	$ 29,682
Commercial and industrial	13,729	13,760	13,822
Other	3,676	3,682	3,585
Operating revenues	48,589	47,584	47,089
OPERATING EXPENSES:
Operation and maintenance	8,891	8,031	8,066
Administrative and general	9,323	9,129	9,082
Depreciation and amortization	6,769	6,422	6,151
Taxes other than income taxes	1,133	1,114	1,129
Operating expenses	26,116	24,696	24,428
Operating income	22,473	22,888	22,661
OTHER INCOME (EXPENSES):
Interest on debt	(5,348)	(5,265)	(5,182)
Allowance for funds used during construction	864	228	206
Gain on sale of land	0	36	0
Other income (expenses), net	(472)	(632)	(456)
Other income (expenses)	(4,956)	(5,633)	(5,432)
Income before income taxes	17,517	17,255	17,229
Income taxes	4,543	5,409	4,740
Net Income	$ 12,974	$ 11,846	$ 12,489
Basic Earnings Per Share (in dollars per share)	$ 1.01	$ 0.92	$ 0.97
Diluted Earnings Per Share (in dollars per share)	1.01	0.92	0.97
Cash Dividends Declared Per Share (in shares)	$ 0.6472	$ 0.6267	$ 0.6040