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Statements of Income (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Statements of Income [Abstract]    
OPERATING REVENUES: $ 14,240 $ 13,081
OPERATING EXPENSES:    
Operation and maintenance 3,451 2,806
Administrative and general 2,657 2,411
Depreciation and amortization 2,480 2,174
Taxes other than income taxes 354 336
Operating expenses 8,942 7,727
Operating income 5,298 5,354
OTHER INCOME (EXPENSES):    
Interest on debt (1,297) (1,214)
Allowance for funds used during construction 295 262
Other pension costs (319) (304)
Other income (expenses), net (349) (101)
Other income (expenses) (1,670) (1,357)
Income before income taxes 3,628 3,997
Income tax (benefit) expense (231) 292
Net Income $ 3,859 $ 3,705
Basic Earnings Per Share (in dollars per share) $ 0.29 $ 0.28
Diluted Earnings Per Share (in dollars per share) $ 0.29 $ 0.28