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CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Income Statement [Abstract]    
Operating Revenues $ 31,177 $ 30,131
Operating Expenses:    
Operations and Maintenance 17,834 15,939
Depreciation 3,609 3,308
Other Taxes 3,384 3,309
Total Operating Expenses 24,827 22,556
Operating Income 6,350 7,575
Other Income (Expense):    
Allowance for Funds Used During Construction 167 119
Other Income (Expense), net 297 206
Total Other Income, net 464 325
Interest Charges 1,138 1,003
Income before Income Taxes 5,676 6,897
Income Taxes 1,182 2,456
Net Income 4,494 4,441
Preferred Stock Dividend Requirements 36 36
Earnings Applicable to Common Stock $ 4,458 $ 4,405
Earnings per share of Common Stock:    
Basic $ 0.27 $ 0.27
Diluted $ 0.27 $ 0.27
Average Number of Common Shares Outstanding:    
Basic 16,354 16,299
Diluted 16,510 16,455
Cash Dividends Paid per Common Share $ 0.2238 $ 0.2113