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CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Income Statement [Abstract]        
Operating Revenues $ 27,401 $ 26,102 $ 50,947 $ 50,098
Operating Expenses:        
Operations and Maintenance 14,765 14,062 29,140 28,093
Depreciation 2,582 2,417 5,130 4,829
Other Taxes 2,844 2,885 5,590 5,670
Total Operating Expenses 20,191 19,364 39,860 38,592
Operating Income 7,210 6,738 11,087 11,506
Other Income (Expense):        
Allowance for Funds Used During Construction 137 197 273 391
Other Income 125 202 317 359
Other Expense (11) (111) (151) (160)
Total Other Income, net 251 288 439 590
Interest Charges 1,779 1,714 3,133 2,928
Income before Income Taxes 5,682 5,312 8,393 9,168
Income Taxes 1,957 1,687 2,861 2,913
Net Income 3,725 3,625 5,532 6,255
Preferred Stock Dividend Requirements 51 51 103 103
Earnings Applicable to Common Stock $ 3,674 $ 3,574 $ 5,429 $ 6,152
Earnings per share of Common Stock:        
Basic $ 0.23 $ 0.23 $ 0.35 $ 0.40
Diluted $ 0.23 $ 0.23 $ 0.35 $ 0.40
Average Number of Common Shares Outstanding:        
Basic 15,716,000 15,598,000 15,704,000 15,587,000
Diluted 15,979,000 15,861,000 15,967,000 15,850,000
Cash Dividends Paid per Common Share $ 0.185 $ 0.1825 $ 0.37 $ 0.365