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Statements of Income (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Statements of Income [Abstract]        
OPERATING REVENUES: $ 14,503 $ 14,257 $ 41,385 $ 40,454
OPERATING EXPENSES:        
Operation and maintenance 2,997 2,659 8,752 7,940
Administrative and general 2,292 2,257 7,144 6,573
Depreciation and amortization 2,223 2,046 6,595 6,113
Taxes other than income taxes 307 274 954 898
Operating expenses 7,819 7,236 23,445 21,524
Operating income 6,684 7,021 17,940 18,930
OTHER INCOME (EXPENSES):        
Interest on debt (1,237) (1,152) (3,673) (3,503)
Allowance for funds used during construction 310 115 883 330
Other pension costs (304) (341) (911) (1,022)
Gain on life insurance 0 0 0 515
Other income (expenses), net (34) (41) (179) (287)
Other income (expenses) (1,265) (1,419) (3,880) (3,967)
Income before income taxes 5,419 5,602 14,060 14,963
Income taxes 625 898 1,077 2,075
Net Income $ 4,794 $ 4,704 $ 12,983 $ 12,888
Basic Earnings Per Share (in dollars per share) $ 0.36 $ 0.36 $ 0.99 $ 0.99
Diluted Earnings Per Share (in dollars per share) $ 0.36 $ 0.36 $ 0.99 $ 0.99