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CONSOLIDATED STATEMENTS OF INCOME - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Statement [Abstract]      
Operating Revenues $ 143,141 $ 141,592 $ 134,598
Operating Expenses:      
Operations and Maintenance 73,671 70,796 67,980
Depreciation 21,109 18,472 16,716
Other Taxes 15,150 14,904 14,382
Total Operating Expenses 109,930 104,172 99,078
Operating Income 33,211 37,420 35,520
Other Income (Expense):      
Allowance for Funds Used During Construction 2,653 4,016 3,146
Other Income (Expense), net 3,305 363 (654)
Total Other Income, net 5,958 4,379 2,492
Interest Charges 8,114 7,493 7,264
Income before Income Taxes 31,055 34,306 30,748
Income Taxes (5,488) (4,119) (3,140)
Net Income 36,543 38,425 33,888
Preferred Stock Dividend Requirements 120 120 132
Earnings Applicable to Common Stock $ 36,423 $ 38,305 $ 33,756
Earnings per share of Common Stock:      
Basic $ 2.08 $ 2.19 $ 2.02
Diluted $ 2.07 $ 2.18 $ 2.01
Average Number of Common Shares Outstanding :      
Basic 17,492 17,459 16,685
Diluted 17,607 17,574 16,829