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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Operating revenues        
Total Operating Revenues $ 20,238 $ 20,502 $ 39,144 $ 39,691
Operating expenses        
Utility operating expenses 9,038 9,588 18,121 18,494
Non-utility operating expenses 671 662 1,334 1,349
Depreciation and amortization 2,541 2,329 5,109 4,648
State and federal income taxes 1,564 1,763 2,903 3,857
Property and other taxes 1,185 1,170 2,468 2,364
Total Operating Expenses 14,999 15,512 29,935 30,712
Operating income 5,239 4,990 9,209 8,979
Other income, net        
Allowance for funds used during construction (AFUDC) 180 76 268 146
Miscellaneous income (expense) 8 (290) 927 293
Income before interest charges 5,427 4,776 10,404 9,418
Interest charges 1,501 1,525 3,000 3,081
Net income applicable to common stock $ 3,926 $ 3,251 $ 7,404 $ 6,337
Income per common share:        
Basic (in dollars per share) $ 0.43 $ 0.35 $ 0.80 $ 0.69
Diluted (in dollars per share) $ 0.42 $ 0.35 $ 0.80 $ 0.69
Weighted average common shares outstanding:        
Basic (in shares) 9,237 9,163 9,230 9,149
Diluted (in shares) 9,293 9,235 9,287 9,220
Cash dividends per share of common stock (in dollars per share) $ 0.2387 $ 0.2317 $ 0.4739 $ 0.4600
Water Sales [Member]        
Operating revenues        
Total Operating Revenues $ 17,869 $ 18,248 $ 34,514 $ 35,183
Other Utility Operating Revenue [Member]        
Operating revenues        
Total Operating Revenues 1,085 1,020 2,084 2,039
Non-Utility Operating Revenue [Member]        
Operating revenues        
Total Operating Revenues $ 1,284 $ 1,234 $ 2,546 $ 2,469