CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) (USD $) In Thousands, except Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Income Statement [Abstract]
Operating Revenues	$ 28,671	$ 29,585	$ 78,769	$ 77,768
Operating Expenses:
Operations and Maintenance	14,667	14,036	42,760	41,205
Depreciation	2,421	2,387	7,250	6,827
Other Taxes	3,067	3,141	8,737	8,532
Total Operating Expenses	20,155	19,564	58,747	56,564
Operating Income	8,516	10,021	20,022	21,204
Other Income (Expense):
Allowance for Funds Used During Construction	235	143	626	785
Other Income	759	172	1,118	532
Other Expense	(20)	(129)	(180)	(181)
Total Other Income, net	974	186	1,564	1,136
Interest Charges	1,703	1,819	4,631	5,125
Income before Income Taxes	7,787	8,388	16,955	17,215
Income Taxes	2,644	2,652	5,557	5,495
Net Income	5,143	5,736	11,398	11,720
Preferred Stock Dividend Requirements	52	52	155	156
Earnings Applicable to Common Stock	$ 5,091	$ 5,684	$ 11,243	$ 11,564
Earnings per share of Common Stock:
Basic	$ 0.33	$ 0.37	$ 0.72	$ 0.81
Diluted	$ 0.32	$ 0.36	$ 0.72	$ 0.80
Average Number of Common Shares Outstanding:
Basic	15,622,000	15,518,000	15,599,000	14,350,000
Diluted	15,885,000	15,781,000	15,862,000	14,613,000
Cash Dividends Paid per Common Share	$ 0.1825	$ 0.1800	$ 0.5475	$ 0.5400