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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating revenues      
Total operating revenues $ 80,411 $ 82,235 $ 79,089
Operating expenses      
Utility operating expenses 38,330 38,277 35,658
Non-utility operating expenses 2,879 2,777 2,602
Depreciation and amortization 10,288 9,555 9,188
State and federal income taxes expense (benefit)      
Current 4,172 (929) 2,849
Deferred 819 8,224 5,482
Property and other taxes 4,968 4,731 4,491
Total Operating Expenses 61,456 62,635 60,270
Operating income 18,955 19,600 18,819
Other income, net      
Allowance for funds used during construction (AFUDC) 622 334 222
Miscellaneous income 953 226 557
Total other income 1,575 560 779
Income before interest charges 20,530 20,160 19,598
Interest charges 6,252 6,177 6,644
Net income applicable to common stock $ 14,278 $ 13,983 $ 12,954
Income per common share:      
Basic (in dollars per share) $ 1.55 $ 1.52 $ 1.42
Diluted (in dollars per share) $ 1.54 $ 1.51 $ 1.41
Weighted average common shares outstanding:      
Basic (in shares) 9,239 9,175 9,098
Diluted (in shares) 9,293 9,242 9,161
Cash dividends per share of common stock (in dollars per share) $ 0.9549 $ 0.9269 $ 0.8997
Water Sales [Member]      
Operating revenues      
Total operating revenues $ 70,829 $ 73,058 $ 70,587
Other Utility Operating Revenue [Member]      
Operating revenues      
Total operating revenues 4,456 4,177 3,816
Non-Utility Operating Revenue [Member]      
Operating revenues      
Total operating revenues $ 5,126 $ 5,000 $ 4,686