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CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Income Statement [Abstract]        
Operating Revenues $ 54,091 $ 55,100 $ 147,715 $ 144,770
Operating Expenses:        
Operations and Maintenance 23,738 25,359 67,913 67,649
Depreciation 6,941 6,309 20,171 18,010
Other Taxes 5,709 5,931 16,460 16,430
Total Operating Expenses 36,388 37,599 104,544 102,089
Operating Income 17,703 17,501 43,171 42,681
Other Income (Expense):        
Allowance for Funds Used During Construction 432 354 1,218 787
Other Income (Expense), net 1,454 1,614 4,364 9,202
Total Other Income, net 1,886 1,968 5,582 9,989
Interest Charges 4,200 3,411 10,535 10,721
Income before Income Taxes 15,389 16,058 38,218 41,949
Income Taxes 1,431 1,739 4,001 6,402
Net Income 13,958 14,319 34,217 35,547
Preferred Stock Dividend Requirements 18 29 59 89
Earnings Applicable to Common Stock, Basic 13,940 14,290 34,158 35,458
Earnings Applicable to Common Stock, Diluted $ 13,940 $ 14,290 $ 34,158 $ 35,458
Earnings per share of Common Stock:        
Basic (in dollars per share) $ 0.77 $ 0.80 $ 1.90 $ 1.99
Diluted (in dollars per share) $ 0.77 $ 0.80 $ 1.90 $ 1.98
Common Shares Outstanding :        
Basic (in shares) 18,123 17,838 17,992 17,828
Diluted (in shares) 18,154 17,952 18,023 17,943