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CONSOLIDATED STATEMENTS OF INCOME - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Statement [Abstract]      
Operating Revenues $ 138,077 $ 130,775 $ 132,906
Operating Expenses:      
Operations and Maintenance 71,570 65,490 65,864
Depreciation 15,037 13,922 12,796
Other Taxes 14,328 13,565 13,944
Total Operating Expenses 100,935 92,977 92,604
Operating Income 37,142 37,798 40,302
Other Income (Expense):      
Allowance for Funds Used During Construction 1,362 702 619
Other Income (Expense), net 1,630 915 (1,151)
Total Other Income (Expense), net 2,992 1,617 (532)
Interest Charges 6,758 5,506 5,293
Income before Income Taxes 33,376 33,909 34,477
Income Taxes 924 11,100 11,735
Net Income 32,452 22,809 22,742
Preferred Stock Dividend Requirements 144 144 144
Earnings Applicable to Common Stock $ 32,308 $ 22,665 $ 22,598
Earnings per share of Common Stock:      
Basic $ 1.97 $ 1.39 $ 1.39
Diluted $ 1.96 $ 1.38 $ 1.38
Average Number of Common Shares Outstanding :      
Basic 16,384,000 16,330,000 16,270,000
Diluted 16,540,000 16,486,000 16,426,000
Cash Dividends Paid per Common Share $ 0.911 $ 0.858 $ 0.808