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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Operating revenues      
Water sales $ 68,932 $ 64,667 $ 61,846
Other utility operating revenue 3,694 3,648 3,253
Non-utility operating revenue 4,398 4,150 3,974
Total operating revenues 77,024 72,465 69,073
Operating expenses      
Utility operating expenses 36,148 34,893 34,509
Non-utility operating expenses 2,305 2,193 2,121
Depreciation and amortization 8,837 8,673 8,251
State and federal income taxes      
Current 2,667 (900) 1,725
Deferred 5,117 7,275 3,863
Property and other taxes 4,368 4,285 4,120
Total operating expenses 59,442 56,419 54,589
Operating income 17,582 16,046 14,484
Other income, net      
Allowance for funds used during construction (AFUDC) 249 329 324
Miscellaneous 472 524 548
Total other income 721 853 872
Income before interest charges 18,303 16,899 15,356
Interest charges 6,998 7,393 7,055
Net income applicable to common stock $ 11,305 $ 9,506 $ 8,301
Income per common share:      
Basic (in dollars per share) $ 1.26 $ 1.07 $ 0.95
Diluted (in dollars per share) $ 1.26 $ 1.07 $ 0.94
Weighted average common shares outstanding:      
Basic (in shares) 8,960 8,884 8,774
Diluted (in shares) 9,005 8,926 8,836
Cash dividends per share of common stock (in dollars per share) $ 0.8733 $ 0.8477 $ 0.8229