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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Operating revenues        
Total Operating Revenues $ 21,924 $ 22,356 $ 61,068 $ 62,047
Operating expenses        
Utility operating expenses 10,333 10,070 28,454 28,564
Non-utility operating expenses 735 736 2,069 2,085
Depreciation and amortization 2,513 2,377 7,623 7,024
State and federal income taxes 1,834 2,546 4,737 6,403
Property and other taxes 1,265 1,173 3,731 3,537
Total Operating Expenses 16,680 16,902 46,614 47,613
Operating income 5,244 5,454 14,454 14,434
Other income, net        
Allowance for funds used during construction (AFUDC) 146 83 413 228
Miscellaneous income (expense) 87 (62) 1,014 231
Income before interest charges 5,477 5,475 15,881 14,893
Interest charges 1,548 1,533 4,548 4,614
Net income applicable to common stock $ 3,929 $ 3,942 $ 11,333 $ 10,279
Income per common share:        
Basic (in dollars per share) $ 0.42 $ 0.43 $ 1.23 $ 1.12
Diluted (in dollars per share) $ 0.42 $ 0.42 $ 1.22 $ 1.11
Weighted average common shares outstanding:        
Basic (in shares) 9,244 9,191 9,235 9,164
Diluted (in shares) 9,299 9,286 9,290 9,262
Cash dividends per share of common stock (in dollars per share) $ 0.2387 $ 0.2317 $ 0.7126 $ 0.6917
Water Sales [Member]        
Operating revenues        
Total Operating Revenues $ 19,469 $ 20,045 $ 53,983 $ 55,228
Other Utility Operating Revenue [Member]        
Operating revenues        
Total Operating Revenues 1,189 1,036 3,273 3,075
Non-Utility Operating Revenue [Member]        
Operating revenues        
Total Operating Revenues $ 1,266 $ 1,275 $ 3,812 $ 3,744