CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Income Statement [Abstract]
Operating Revenues	$ 27,038	$ 23,546
Operating Expenses:
Operations and Maintenance	15,430	14,375
Depreciation	2,709	2,548
Other Taxes	3,034	2,746
Total Operating Expenses	21,173	19,669
Operating Income	5,865	3,877
Other Income (Expense):
Allowance for Funds Used During Construction	38	136
Other Income	97	192
Other Expense	(10)	(140)
Total Other Income, net	125	188
Interest Charges	1,155	1,354
Income before Income Taxes	4,835	2,711
Income Taxes	1,658	904
Net Income	3,177	1,807
Preferred Stock Dividend Requirements	52	52
Earnings Applicable to Common Stock	$ 3,125	$ 1,755
Earnings per share of Common Stock:
Basic	$ 0.20	$ 0.11
Diluted	$ 0.20	$ 0.11
Average Number of Common Shares Outstanding:
Basic	15,806,000	15,692,000
Diluted	16,069,000	15,955,000
Cash Dividends Paid per Common Share	$ 0.1875	$ 0.1850