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CONSOLIDATED STATEMENTS OF INCOME (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Consolidated Statements Of Income      
Operating Revenues $ 102,069 $ 102,735 $ 91,243
Operating Expenses:      
Operations and Maintenance 56,634 55,481 52,348
Depreciation 9,746 9,244 8,559
Other Taxes 11,488 11,413 10,175
Total Operating Expenses 77,868 76,138 71,082
Operating Income 24,201 26,597 20,161
Other Income (Expense):      
Allowance for Funds Used During Construction 821 970 1,001
Other Income 1,523 912 1,011
Other Expense (195) (438) (286)
Total Other Income, net 2,149 1,444 1,726
Interest Charges 6,376 6,925 6,750
Income before Income Taxes 19,974 21,116 15,137
Income Taxes 6,527 6,786 5,160
Net Income 13,447 14,330 9,977
Preferred Stock Dividend Requirements 206 207 208
Earnings Applicable to Common Stock $ 13,241 $ 14,123 $ 9,769
Earnings per share of Common Stock:      
Basic $ 0.85 $ 0.96 $ 0.73
Diluted $ 0.84 $ 0.96 $ 0.72
Average Number of Common Shares Outstanding:      
Basic 15,614,556 14,653,899 13,453,563
Diluted 15,877,126 14,916,469 13,716,133
Cash Dividends Paid per Common Share $ 0.733 $ 0.723 $ 0.713