Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Statements of Income [Abstract]
OPERATING REVENUES	$ 51,578	$ 48,437
OPERATING EXPENSES:
Operation and maintenance	10,387	9,670
Administrative and general	8,517	8,095
Depreciation and amortization	7,688	7,010
Taxes other than income taxes	1,200	1,145
Operating expenses	27,792	25,920
Operating income	23,786	22,517
OTHER INCOME (EXPENSES):
Interest on debt	(5,124)	(5,509)
Allowance for funds used during construction	366	229
Other pension costs	(1,451)	(1,285)
Other income (expenses), net	(935)	(85)
Other income (expenses)	(7,144)	(6,650)
Income before income taxes	16,642	15,867
Income taxes	2,240	2,491
Net Income	$ 14,402	$ 13,376
Basic Earnings Per Share (in dollars per share)	$ 1.11	$ 1.04
Diluted Earnings Per Share (in dollars per share)	$ 1.11	$ 1.04