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Statements of Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Statements of Income [Abstract]    
OPERATING REVENUES: $ 55,119 $ 53,852
OPERATING EXPENSES:    
Operation and maintenance 11,822 10,781
Administrative and general 9,754 9,258
Depreciation and amortization 8,859 8,177
Taxes other than income taxes 1,288 1,205
Operating expenses 31,723 29,421
Operating income 23,396 24,431
OTHER INCOME (EXPENSES):    
Interest on debt (4,926) (4,707)
Allowance for funds used during construction 1,221 530
Other pension costs (1,214) (1,362)
Gain on life insurance 0 515
Other income (expenses), net (373) (791)
Other income (expenses) (5,292) (5,815)
Income before income taxes 18,104 18,616
Income taxes 1,120 2,018
Net Income $ 16,984 $ 16,598
Basic Earnings Per Share (in dollars per share) $ 1.30 $ 1.27
Diluted Earnings Per Share (in dollars per share) $ 1.30 $ 1.27