Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statements of Income (Unaudited) [Abstract]
OPERATING REVENUES	$ 13,320	$ 13,048	$ 26,197	$ 24,879
OPERATING EXPENSES:
Operation and maintenance	2,618	2,646	5,281	5,053
Administrative and general	2,072	2,103	4,316	4,009
Depreciation and amortization	2,043	1,933	4,067	3,824
Taxes other than income taxes	294	292	624	633
Operating expenses	7,027	6,974	14,288	13,519
Operating income	6,293	6,074	11,909	11,360
OTHER INCOME (EXPENSES):
Interest on debt	(1,156)	(1,296)	(2,351)	(2,623)
Allowance for funds used during construction	114	87	215	156
Other pension costs	(340)	(363)	(681)	(726)
Gain on life insurance	0	0	515	0
Other income (expenses), net	(121)	(121)	(246)	(272)
Other income (expenses)	(1,503)	(1,693)	(2,548)	(3,465)
Income before income taxes	4,790	4,381	9,361	7,895
Income taxes	608	664	1,177	1,365
Net Income	$ 4,182	$ 3,717	$ 8,184	$ 6,530
Basic Earnings Per Share (in dollars per share)	$ 0.32	$ 0.28	$ 0.63	$ 0.50
Diluted Earnings Per Share (in dollars per share)	$ 0.32	$ 0.28	$ 0.63	$ 0.50