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CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Income Statement [Abstract]        
Operating Revenues $ 37,769 $ 38,713 $ 101,859 $ 104,809
Operating Expenses:        
Operations and Maintenance 17,669 18,114 50,569 52,773
Depreciation 4,246 3,792 12,415 11,137
Other Taxes 3,871 3,889 10,913 10,910
Total Operating Expenses 25,786 25,795 73,897 74,820
Operating Income 11,983 12,918 27,962 29,989
Other Income (Expense):        
Allowance for Funds Used During Construction 871 424 2,030 805
Other Income (Expense), net (4) 409 (142) 1,277
Total Other Income, net 867 833 1,888 2,082
Interest Charges 1,996 1,723 4,984 4,929
Income before Income Taxes 10,854 12,028 24,866 27,142
Income Taxes (265) (262) (952) 1,683
Net Income 11,119 12,290 25,818 25,459
Preferred Stock Dividend Requirements 30 36 102 108
Earnings Applicable to Common Stock $ 11,089 $ 12,254 $ 25,716 $ 25,351
Earnings per share of Common Stock:        
Basic $ 0.67 $ 0.75 $ 1.56 $ 1.55
Diluted $ 0.66 $ 0.74 $ 1.55 $ 1.54
Average Number of Common Shares Outstanding:        
Basic 16,610 16,394 16,520 16,379
Diluted 16,757 16,550 16,673 16,535