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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating revenues      
Water sales $ 73,058 $ 70,587 $ 68,932
Other utility operating revenue 4,177 3,816 3,694
Non-utility operating revenue 5,000 4,686 4,398
Total operating revenues 82,235 79,089 77,024
Operating expenses      
Utility operating expenses 38,277 35,658 36,148
Non-utility operating expenses 2,777 2,602 2,305
Depreciation and amortization 9,555 9,188 8,837
State and federal income taxes (benefit) expense      
Current (929) 2,849 2,667
Deferred 8,224 5,482 5,117
Property and other taxes 4,731 4,491 4,368
Total operating expenses 62,635 60,270 59,442
Operating income 19,600 18,819 17,582
Other income, net      
Allowance for funds used during construction (AFUDC) 334 222 249
Miscellaneous income 226 557 472
Total other income 560 779 721
Income before interest charges 20,160 19,598 18,303
Interest charges 6,177 6,644 6,998
Net income applicable to common stock $ 13,983 $ 12,954 $ 11,305
Income per common share:      
Basic (in dollars per share) $ 1.52 $ 1.42 $ 1.26
Diluted (in dollars per share) $ 1.51 $ 1.41 $ 1.26
Weighted average common shares outstanding:      
Basic (in shares) 9,175 9,098 8,960
Diluted (in shares) 9,242 9,161 9,005
Cash dividends paid per share of common stock (in dollars per share) $ 0.9269 $ 0.8997 $ 0.8733