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CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Operating revenues      
Water sales $ 63,607 $ 57,564 $ 56,685
Other utility operating revenue 3,169 3,302 2,973
Non-utility operating revenue 3,787 4,204 5,227
Total operating revenues 70,563 65,070 64,885
Operating expenses      
Utility operating expenses 34,117 32,300 30,934
Non-utility operating expenses 2,100 3,148 3,780
Depreciation and amortization 7,930 7,410 7,032
State and federal income taxes      
Current 1,940 106 950
Deferred 4,676 4,548 4,132
Property and other taxes 3,945 3,822 3,789
Total operating expenses 54,708 51,334 50,617
Operating income 15,855 13,736 14,268
Other income, net      
Allowance for funds used during construction (AFUDC) 323 163 183
Miscellaneous 713 136 464
Total other income 1,036 299 647
Income before interest charges 16,891 14,035 14,915
Interest charges 7,045 7,289 7,295
Net income applicable to common stock $ 9,846 $ 6,746 $ 7,620
Income per common share:      
Basic (in dollars per share) $ 1.14 $ 0.83 $ 1.01
Diluted (in dollars per share) $ 1.13 $ 0.83 $ 1.00
Weighted average common shares outstanding:      
Basic (in shares) 8,666 8,122 7,557
Diluted (in shares) 8,717 8,160 7,618
Cash dividends per share of common stock (in dollars per share) $ 0.7913 $ 0.7626 $ 0.7529