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Statements of Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Statements of Income [Abstract]    
OPERATING REVENUES $ 53,852 $ 51,578
OPERATING EXPENSES:    
Operation and maintenance 10,781 10,387
Administrative and general 9,258 8,517
Depreciation and amortization 8,177 7,688
Taxes other than income taxes 1,205 1,200
Operating expenses 29,421 27,792
Operating income 24,431 23,786
OTHER INCOME (EXPENSES):    
Interest on debt (4,707) (5,124)
Allowance for funds used during construction 530 366
Other pension costs (1,362) (1,451)
Gain on life insurance 515 0
Other income (expenses), net (791) (935)
Other income (expenses) (5,815) (7,144)
Income before income taxes 18,616 16,642
Income taxes 2,018 2,240
Net Income $ 16,598 $ 14,402
Basic Earnings Per Share (in dollars per share) $ 1.27 $ 1.11
Diluted Earnings Per Share (in dollars per share) $ 1.27 $ 1.11