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Statements of Income (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Statements of Income [Abstract]        
OPERATING REVENUES: $ 13,801 $ 13,320 $ 26,882 $ 26,197
OPERATING EXPENSES:        
Operation and maintenance 2,949 2,618 5,755 5,281
Administrative and general 2,441 2,072 4,852 4,316
Depreciation and amortization 2,198 2,043 4,372 4,067
Taxes other than income taxes 311 294 647 624
Operating expenses 7,899 7,027 15,626 14,288
Operating income 5,902 6,293 11,256 11,909
OTHER INCOME (EXPENSES):        
Interest on debt (1,222) (1,156) (2,436) (2,351)
Allowance for funds used during construction 311 114 573 215
Other pension costs (303) (340) (607) (681)
Gain on life insurance 0 0 0 515
Other income (expenses), net (44) (121) (145) (246)
Other income (expenses) (1,258) (1,503) (2,615) (2,548)
Income before income taxes 4,644 4,790 8,641 9,361
Income taxes 160 608 452 1,177
Net Income $ 4,484 $ 4,182 $ 8,189 $ 8,184
Basic Earnings Per Share (in dollars per share) $ 0.35 $ 0.32 $ 0.63 $ 0.63
Diluted Earnings Per Share (in dollars per share) $ 0.35 $ 0.32 $ 0.63 $ 0.63