Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statements of Income (Unaudited) [Abstract]
Operating revenues	$ 11,831	$ 11,644
OPERATING EXPENSES:
Operation and maintenance	2,407	2,354
Administrative and general	1,906	1,995
Depreciation and amortization	1,891	1,841
Taxes other than income taxes	341	314
Operating expenses	6,545	6,504
Operating income	5,286	5,140
OTHER INCOME (EXPENSES):
Interest on debt	(1,327)	(1,364)
Allowance for funds used during construction	69	92
Other pension costs	(363)	(321)
Other income (expenses), net	(151)	(82)
Other income (expenses)	(1,772)	(1,675)
Income before income taxes	3,514	3,465
Income taxes	701	871
Net Income	$ 2,813	$ 2,594
Basic Earnings Per Share (in dollars per share)	$ 0.22	$ 0.20
Diluted Earnings Per Share (in dollars per share)	0.22	0.20
Cash Dividends Declared Per Share (in dollars per share)	$ 0.1733	$ 0.1666