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Statements of Income (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Statements of Income [Abstract]    
OPERATING REVENUES: $ 13,081 $ 12,877
OPERATING EXPENSES:    
Operation and maintenance 2,806 2,663
Administrative and general 2,411 2,244
Depreciation and amortization 2,174 2,024
Taxes other than income taxes 336 330
Operating expenses 7,727 7,261
Operating income 5,354 5,616
OTHER INCOME (EXPENSES):    
Interest on debt (1,214) (1,195)
Allowance for funds used during construction 262 101
Other pension costs (304) (341)
Gain on life insurance 0 515
Other income (expenses), net (101) (125)
Other income (expenses) (1,357) (1,045)
Income before income taxes 3,997 4,571
Income taxes 292 569
Net Income $ 3,705 $ 4,002
Basic Earnings Per Share (in dollars per share) $ 0.28 $ 0.31
Diluted Earnings Per Share (in dollars per share) $ 0.28 $ 0.31