CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Operating revenues
Total Tariff Revenue	$ 21,752	$ 20,652	$ 41,653	$ 40,037
Operating expenses
Utility operating expenses	9,359	9,249	18,593	18,370
Non-utility operating expenses	733	779	1,462	1,546
Depreciation and amortization	2,693	2,724	5,445	5,438
State and federal income taxes	1,537	1,325	2,896	2,504
Property and other taxes	1,306	1,255	2,672	2,575
Total Operating Expenses	15,628	15,332	31,068	30,433
Operating income	6,124	5,320	10,585	9,604
Other income, net
Allowance for funds used during construction (AFUDC)	338	266	762	492
Miscellaneous income	(13)	(58)	1,075	742
Income before interest charges	6,449	5,528	12,422	10,838
Interest charges	1,883	1,750	3,782	3,470
Net income applicable to common stock	$ 4,566	$ 3,778	$ 8,640	$ 7,368
Income per common share:
Basic (in dollars per share)	$ 0.49	$ 0.41	$ 0.93	$ 0.80
Diluted (in dollars per share)	$ 0.49	$ 0.41	$ 0.92	$ 0.79
Weighted average common shares outstanding:
Basic (in shares)	9,326	9,276	9,311	9,267
Diluted (in shares)	9,367	9,324	9,357	9,319
Cash dividends per share of common stock (in dollars per share)	$ 0.2496	$ 0.2459	$ 0.4992	$ 0.4882
Water Sales [Member]
Operating revenues
Total Tariff Revenue	$ 19,423	$ 18,192	$ 36,816	$ 35,125
Other Utility Operating Revenue [Member]
Operating revenues
Total Tariff Revenue	1,084	1,150	2,336	2,270
Non-Utility Operating Revenue [Member]
Operating revenues
Total Tariff Revenue	$ 1,245	$ 1,310	$ 2,501	$ 2,642