CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Operating revenues
Non-Tariff Revenue	$ 20,652	$ 20,238	$ 40,037	$ 39,144
Operating expenses
Utility operating expenses	9,249	9,038	18,370	18,121
Non-utility operating expenses	779	671	1,546	1,334
Depreciation and amortization	2,724	2,541	5,438	5,109
State and federal income taxes	1,325	1,564	2,504	2,903
Property and other taxes	1,255	1,185	2,575	2,468
Total Operating Expenses	15,332	14,999	30,433	29,935
Operating income	5,320	5,239	9,604	9,209
Other income, net
Allowance for funds used during construction (AFUDC)	266	180	492	268
Miscellaneous (expense) income	(58)	8	742	927
Income before interest charges	5,528	5,427	10,838	10,404
Interest charges	1,750	1,501	3,470	3,000
Net income applicable to common stock	$ 3,778	$ 3,926	$ 7,368	$ 7,404
Income per common share:
Basic (in dollars per share)	$ 0.41	$ 0.43	$ 0.80	$ 0.80
Diluted (in dollars per share)	$ 0.41	$ 0.42	$ 0.79	$ 0.80
Weighted average common shares outstanding:
Basic (in shares)	9,276	9,237	9,267	9,230
Diluted (in shares)	9,324	9,293	9,319	9,287
Cash dividends per share of common stock (in dollars per share)	$ 0.2459	$ 0.2387	$ 0.4882	$ 0.4739
Water Sales [Member]
Operating revenues
Non-Tariff Revenue	$ 18,192	$ 17,869	$ 35,125	$ 34,514
Other Utility Operating Revenue [Member]
Operating revenues
Non-Tariff Revenue	1,150	1,085	2,270	2,084
Non-Utility Operating Revenue [Member]
Operating revenues
Non-Tariff Revenue	$ 1,310	$ 1,284	$ 2,642	$ 2,546