CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Operating revenues
Non-Tariff Revenue	$ 22,549	$ 21,924	$ 62,586	$ 61,068
Operating expenses
Utility operating expenses	10,495	10,333	28,865	28,454
Non-utility operating expenses	838	735	2,385	2,069
Depreciation and amortization	2,679	2,513	8,117	7,623
State and federal income taxes	1,498	1,834	4,002	4,737
Property and other taxes	1,309	1,265	3,884	3,731
Total Operating Expenses	16,819	16,680	47,253	46,614
Operating income	5,730	5,244	15,333	14,454
Other income, net
Allowance for funds used during construction (AFUDC)	566	146	1,058	413
Miscellaneous (expense) income	(73)	87	670	1,014
Income before interest charges	6,223	5,477	17,061	15,881
Interest charges	1,765	1,548	5,235	4,548
Net income applicable to common stock	$ 4,458	$ 3,929	$ 11,826	$ 11,333
Income per common share:
Basic (in dollars per share)	$ 0.48	$ 0.43	$ 1.28	$ 1.23
Diluted (in dollars per share)	$ 0.48	$ 0.42	$ 1.27	$ 1.22
Weighted average common shares outstanding:
Basic (in shares)	9,283	9,244	9,272	9,235
Diluted (in shares)	9,329	9,299	9,322	9,290
Cash dividends per share of common stock (in dollars per share)	$ 0.2459	$ 0.2387	$ 0.7341	$ 0.7126
Water Sales [Member]
Operating revenues
Non-Tariff Revenue	$ 20,102	$ 19,469	$ 55,227	$ 53,983
Other Utility Operating Revenue [Member]
Operating revenues
Non-Tariff Revenue	1,245	1,189	3,515	3,273
Non-Utility Operating Revenue [Member]
Operating revenues
Non-Tariff Revenue	$ 1,202	$ 1,266	$ 3,844	$ 3,812