Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statements of Income [Abstract]
OPERATING REVENUES	$ 14,257	$ 13,680	$ 40,454	$ 38,559
OPERATING EXPENSES:
Operation and maintenance	2,659	2,586	7,940	7,639
Administrative and general	2,257	2,172	6,573	6,181
Depreciation and amortization	2,046	1,926	6,113	5,750
Taxes other than income taxes	274	281	898	914
Operating expenses	7,236	6,965	21,524	20,484
Operating income	7,021	6,715	18,930	18,075
OTHER INCOME (EXPENSES):
Interest on debt	(1,152)	(1,314)	(3,503)	(3,937)
Allowance for funds used during construction	115	117	330	273
Other pension costs	(341)	(362)	(1,022)	(1,088)
Gain on life insurance	0	0	515	0
Other income (expenses), net	(41)	(81)	(287)	(353)
Other income (expenses)	(1,419)	(1,640)	(3,967)	(5,105)
Income before income taxes	5,602	5,075	14,963	12,970
Income taxes	898	592	2,075	1,957
Net Income	$ 4,704	$ 4,483	$ 12,888	$ 11,013
Basic Earnings Per Share (in dollars per share)	$ 0.36	$ 0.35	$ 0.99	$ 0.85
Diluted Earnings Per Share (in dollars per share)	$ 0.36	$ 0.35	$ 0.99	$ 0.85