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CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Income Statement [Abstract]        
Operating Revenues $ 32,353 $ 28,671 $ 83,300 $ 78,769
Operating Expenses:        
Operations and Maintenance 15,600 14,667 44,740 42,760
Depreciation 2,629 2,421 7,759 7,250
Other Taxes 3,281 3,067 8,871 8,737
Total Operating Expenses 21,510 20,155 61,370 58,747
Operating Income 10,843 8,516 21,930 20,022
Other Income (Expense):        
Allowance for Funds Used During Construction 110 235 383 626
Other Income 106 759 423 1,118
Other Expense (4) (20) (155) (180)
Total Other Income, net 212 974 651 1,564
Interest Charges 1,808 1,703 4,941 4,631
Income before Income Taxes 9,247 7,787 17,640 16,955
Income Taxes 3,109 2,644 5,970 5,557
Net Income 6,138 5,143 11,670 11,398
Preferred Stock Dividend Requirements 52 52 155 155
Earnings Applicable to Common Stock $ 6,086 $ 5,091 $ 11,515 $ 11,243
Earnings per share of Common Stock:        
Basic $ 0.39 $ 0.33 $ 0.73 $ 0.72
Diluted $ 0.38 $ 0.32 $ 0.73 $ 0.72
Average Number of Common Shares Outstanding:        
Basic 15,741,000 15,622,000 15,717,000 15,599,000
Diluted 16,004,000 15,885,000 15,980,000 15,862,000
Cash Dividends Paid per Common Share $ 0.1850 $ 0.1825 $ 0.5550 $ 0.5475