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Statements of Income (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Statements of Income [Abstract]        
OPERATING REVENUES: $ 18,767 $ 14,899 $ 34,168 $ 29,139
OPERATING EXPENSES:        
Operation and maintenance 4,105 2,915 8,217 6,366
Administrative and general 2,757 2,579 5,423 5,236
Depreciation and amortization 3,019 2,493 5,833 4,973
Taxes other than income taxes 370 338 761 692
Operating expenses 10,251 8,325 20,234 17,267
Operating income 8,516 6,574 13,934 11,872
OTHER INCOME (EXPENSES):        
Interest on debt (1,678) (1,205) (3,191) (2,502)
Allowance for funds used during construction 844 225 1,593 520
Other pension costs (239) (319) (603) (638)
Other income (expenses), net (206) (80) (300) (429)
Other income (expenses) (1,279) (1,379) (2,501) (3,049)
Income before income taxes 7,237 5,195 11,433 8,823
Income tax (benefit) expense 713 166 1,256 (65)
Net Income $ 6,524 $ 5,029 $ 10,177 $ 8,888
Basic Earnings Per Share (in dollars per share) $ 0.45 $ 0.36 $ 0.71 $ 0.65
Diluted Earnings Per Share (in dollars per share) $ 0.45 $ 0.36 $ 0.71 $ 0.65