CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Income Statement [Abstract]
Operating Revenues	$ 29,190	$ 29,102	$ 56,363	$ 56,140
Operating Expenses:
Operations and Maintenance	14,563	15,148	30,000	30,578
Depreciation	2,837	2,725	5,652	5,434
Other Taxes	3,043	3,058	5,997	6,092
Total Operating Expenses	20,443	20,931	41,649	42,104
Operating Income	8,747	8,171	14,714	14,036
Other Income (Expense):
Allowance for Funds Used During Construction	66	89	133	127
Other Income	135	0	146	97
Other Expenses	(155)	(11)	(175)	(21)
Total Other Income, net	46	78	104	203
Interest Charges	1,515	1,538	2,618	2,693
Income before Income Taxes	7,278	6,711	12,200	11,546
Income Taxes	2,550	2,230	4,303	3,888
Net Income	4,728	4,481	7,897	7,658
Preferred Stock Dividend Requirements	36	51	79	103
Earnings Applicable to Common Stock	$ 4,692	$ 4,430	$ 7,818	$ 7,555
Earnings per share of Common Stock:
Basic (in dollars per share)	$ 0.29	$ 0.28	$ 0.49	$ 0.48
Diluted (in dollars per share)	$ 0.29	$ 0.28	$ 0.49	$ 0.47
Average Number of Common Shares Outstanding :
Basic (in shares)	16,018	15,829	15,996	15,818
Diluted (in shares)	16,199	16,092	16,190	16,081
Cash Dividends Paid per Common Share (in dollars per share)	$ 0.1900	$ 0.1875	$ 0.3800	$ 0.3750