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Statements of Income (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Statements of Income [Abstract]        
OPERATING REVENUES: $ 15,811 $ 14,503 $ 44,950 $ 41,385
OPERATING EXPENSES:        
Operation and maintenance 3,746 2,997 10,112 8,752
Administrative and general 2,328 2,292 7,564 7,144
Depreciation and amortization 2,572 2,223 7,545 6,595
Taxes other than income taxes 309 307 1,001 954
Operating expenses 8,955 7,819 26,222 23,445
Operating income 6,856 6,684 18,728 17,940
OTHER INCOME (EXPENSES):        
Interest on debt (1,204) (1,237) (3,706) (3,673)
Allowance for funds used during construction 382 310 902 883
Other pension costs (318) (304) (956) (911)
Other income (expenses), net (117) (34) (546) (179)
Other income (expenses) (1,257) (1,265) (4,306) (3,880)
Income before income taxes 5,599 5,419 14,422 14,060
Income taxes (82) 625 (147) 1,077
Net Income $ 5,681 $ 4,794 $ 14,569 $ 12,983
Basic Earnings Per Share (in dollars per share) $ 0.4 $ 0.36 $ 1.05 $ 0.99
Diluted Earnings Per Share (in dollars per share) $ 0.4 $ 0.36 $ 1.05 $ 0.99