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CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Income Statement [Abstract]    
Operating Revenues $ 31,769 $ 30,698
Operating Expenses:    
Operations and Maintenance 17,192 16,120
Depreciation 4,448 4,046
Other Taxes 3,602 3,504
Total Operating Expenses 25,242 23,670
Operating Income 6,527 7,028
Other Income (Expense):    
Allowance for Funds Used During Construction 1,123 515
Other Income (Expense), net 385 (57)
Total Other Income, net 1,508 458
Interest Charges 1,669 1,200
Income before Income Taxes 6,366 6,286
Income Taxes (1,302) (266)
Net Income 7,668 6,552
Preferred Stock Dividend Requirements 30 36
Earnings Applicable to Common Stock $ 7,638 $ 6,516
Earnings per share of Common Stock:    
Basic $ 0.44 $ 0.40
Diluted $ 0.44 $ 0.39
Average Number of Common Shares Outstanding:    
Basic 17,437 16,428
Diluted 17,552 16,584