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Statements of Income (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Statements of Income [Abstract]        
OPERATING REVENUES: $ 14,899 $ 13,801 $ 29,139 $ 26,882
OPERATING EXPENSES:        
Operation and maintenance 2,915 2,949 6,366 5,755
Administrative and general 2,579 2,441 5,236 4,852
Depreciation and amortization 2,493 2,198 4,973 4,372
Taxes other than income taxes 338 311 692 647
Operating expenses 8,325 7,899 17,267 15,626
Operating income 6,574 5,902 11,872 11,256
OTHER INCOME (EXPENSES):        
Interest on debt (1,205) (1,222) (2,502) (2,436)
Allowance for funds used during construction 225 311 520 573
Other pension costs (319) (303) (638) (607)
Other income (expenses), net (80) (44) (429) (145)
Other income (expenses) (1,379) (1,258) (3,049) (2,615)
Income before income taxes 5,195 4,644 8,823 8,641
Income taxes 166 160 (65) 452
Net Income $ 5,029 $ 4,484 $ 8,888 $ 8,189
Basic Earnings Per Share (in dollars per share) $ 0.36 $ 0.35 $ 0.65 $ 0.63
Diluted Earnings Per Share (in dollars per share) $ 0.36 $ 0.35 $ 0.65 $ 0.63