CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) [Abstract]
Operating Revenues	$ 32,669	$ 31,285	$ 89,032	$ 87,424
Operating Expenses:
Operations and Maintenance	14,956	15,120	44,957	45,698
Depreciation	2,880	2,772	8,532	8,205
Other Taxes	3,213	3,123	9,210	9,215
Total Operating Expenses	21,049	21,015	62,699	63,118
Operating Income	11,620	10,270	26,333	24,306
Other Income (Expense):
Allowance for Funds Used During Construction	80	104	213	230
Other Income	49	27	195	124
Other Expenses	(44)	(1)	(218)	(21)
Total Other Income, net	85	130	190	333
Interest Charges	1,516	1,541	4,134	4,234
Income before Income Taxes	10,189	8,859	22,389	20,405
Income Taxes	3,431	3,052	7,735	6,940
Net Income	6,758	5,807	14,654	13,465
Preferred Stock Dividend Requirements	36	44	115	147
Earnings Applicable to Common Stock	$ 6,722	$ 5,763	$ 14,539	$ 13,318
Earnings per share of Common Stock:
Basic (in dollars per share)	$ 0.42	$ 0.36	$ 0.91	$ 0.84
Diluted (in dollars per share)	$ 0.42	$ 0.36	$ 0.90	$ 0.83
Average Number of Common Shares Outstanding :
Basic (in shares)	16,097	15,882	16,030	15,839
Diluted (in shares)	16,253	16,117	16,211	16,093
Cash Dividends Paid per Common Share (in dollars per share)	$ 0.1900	$ 0.1875	$ 0.5700	$ 0.5625