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CONSOLIDATED STATEMENTS OF INCOME - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Statement [Abstract]      
Operating Revenues $ 130,775 $ 132,906 $ 126,025
Operating Expenses:      
Operations and Maintenance 64,668 65,534 65,167
Depreciation 13,922 12,796 12,051
Other Taxes 13,565 13,944 12,967
Total Operating Expenses 92,155 92,274 90,185
Operating Income 38,620 40,632 35,840
Other Income (Expense):      
Allowance for Funds Used During Construction 702 619 380
Other Income 123 662 208
Other Expense (30) (2,143) (295)
Total Other Income (Expense), net 795 (862) 293
Interest Charges 5,506 5,293 5,554
Income before Income Taxes 33,909 34,477 30,579
Income Taxes 11,100 11,735 10,551
Net Income 22,809 22,742 20,028
Preferred Stock Dividend Requirements 144 144 144
Earnings Applicable to Common Stock $ 22,665 $ 22,598 $ 19,884
Earnings per share of Common Stock:      
Basic $ 1.39 $ 1.39 $ 1.23
Diluted $ 1.38 $ 1.38 $ 1.22
Average Number of Common Shares Outstanding :      
Basic 16,330,000 16,270,000 16,175,000
Diluted 16,486,000 16,426,000 16,331,000
Cash Dividends Paid per Common Share $ 0.858 $ 0.808 $ 0.776