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CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Income Statement [Abstract]        
Operating Revenues $ 35,277 $ 33,393 $ 67,046 $ 64,090
Operating Expenses:        
Operations and Maintenance 17,620 16,781 34,812 32,901
Depreciation 4,629 4,123 9,077 8,170
Other Taxes 3,643 3,539 7,245 7,042
Total Operating Expenses 25,892 24,443 51,134 48,113
Operating Income 9,385 8,950 15,912 15,977
Other Income (Expense):        
Allowance for Funds Used During Construction 795 643 1,917 1,158
Other Income (Expense), net 334 (80) 720 (138)
Total Other Income, net 1,129 563 2,637 1,020
Interest Charges 1,946 1,788 3,615 2,988
Income before Income Taxes 8,568 7,725 14,934 14,009
Income Taxes (1,145) (421) (2,447) (687)
Net Income 9,713 8,146 17,381 14,696
Preferred Stock Dividend Requirements 30 36 60 72
Earnings Applicable to Common Stock $ 9,683 $ 8,110 $ 17,321 $ 14,624
Earnings per share of Common Stock:        
Basic $ 0.55 $ 0.49 $ 0.99 $ 0.89
Diluted $ 0.55 $ 0.49 $ 0.99 $ 0.88
Average Number of Common Shares Outstanding :        
Basic 17,462 16,519 17,449 16,474
Diluted 17,577 16,675 17,564 16,630