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CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Income Statement [Abstract]    
Operating Revenues $ 30,131 $ 30,579
Operating Expenses:    
Operations and Maintenance 15,734 15,828
Depreciation 3,308 3,137
Other Taxes 3,309 3,312
Total Operating Expenses 22,351 22,277
Operating Income 7,780 8,302
Other Income (Expense):    
Allowance for Funds Used During Construction 119 61
Other Income 6 48
Other Expense (5) (18)
Total Other Income, net 120 91
Interest Charges 1,003 978
Income before Income Taxes 6,897 7,415
Income Taxes 2,456 2,625
Net Income 4,441 4,790
Preferred Stock Dividend Requirements 36 36
Earnings Applicable to Common Stock $ 4,405 $ 4,754
Earnings per share of Common Stock:    
Basic $ 0.27 $ 0.29
Diluted $ 0.27 $ 0.29
Average Number of Common Shares Outstanding:    
Basic 16,299 16,233
Diluted 16,455 16,389
Cash Dividends Paid per Common Share $ 0.2113 $ 0.1988