Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statements of Income (Unaudited) [Abstract]
OPERATING REVENUES	$ 13,680	$ 12,698	$ 38,559	$ 36,368
OPERATING EXPENSES:
Operation and maintenance	2,586	2,280	7,639	7,197
Administrative and general	2,172	1,944	6,181	6,193
Depreciation and amortization	1,926	1,770	5,750	5,235
Taxes other than income taxes	281	275	914	856
Operating expenses	6,965	6,269	20,484	19,481
Operating income	6,715	6,429	18,075	16,887
OTHER INCOME (EXPENSES):
Interest on debt	(1,314)	(1,377)	(3,937)	(4,117)
Allowance for funds used during construction	117	53	273	176
Other pension costs	(362)	(322)	(1,088)	(964)
Other income (expenses), net	(81)	(54)	(353)	(213)
Other income (expenses)	(1,640)	(1,700)	(5,105)	(5,118)
Income before income taxes	5,075	4,729	12,970	11,769
Income taxes	592	929	1,957	2,070
Net Income	$ 4,483	$ 3,800	$ 11,013	$ 9,699
Basic Earnings Per Share (in dollars per share)	$ 0.35	$ 0.29	$ 0.85	$ 0.75
Diluted Earnings Per Share (in dollars per share)	$ 0.35	$ 0.29	$ 0.85	$ 0.75