CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Operating revenues
Total Operating Revenues	$ 24,987	$ 24,737	$ 68,284	$ 66,390
Operating expenses
Utility operating expenses	10,957	10,947	30,307	29,541
Non-utility operating expenses	979	926	2,756	2,387
Depreciation and amortization	2,969	2,835	8,958	8,280
State and federal income taxes	1,784	1,784	4,677	4,680
Property and other taxes	1,400	1,376	4,160	4,048
Total Operating Expenses	18,089	17,868	50,858	48,936
Operating income	6,898	6,869	17,426	17,454
Other income, net
Allowance for funds used during construction (AFUDC)	112	155	727	917
Miscellaneous (expense) income	(44)	(53)	1,299	1,022
Income before interest charges	6,966	6,971	19,452	19,393
Interest charges	1,910	1,908	5,685	5,690
Net income applicable to common stock	$ 5,056	$ 5,063	$ 13,767	$ 13,703
Income per common share:
Basic (in dollars per share)	$ 0.54	$ 0.54	$ 1.47	$ 1.47
Diluted (in dollars per share)	$ 0.54	$ 0.54	$ 1.46	$ 1.46
Weighted average common shares outstanding:
Basic (in shares)	9,404	9,338	9,389	9,320
Diluted (in shares)	9,432	9,377	9,421	9,363
Cash dividends per share of common stock (in dollars per share)	$ 0.2610	$ 0.2496	$ 0.7791	$ 0.7488
Water Sales [Member]
Operating revenues
Total Operating Revenues	$ 21,279	$ 21,362	$ 59,187	$ 58,178
Other Utility Operating Revenue [Member]
Operating revenues
Total Operating Revenues	2,245	2,080	4,818	4,416
Non-Utility Operating Revenue [Member]
Operating revenues
Total Operating Revenues	$ 1,463	$ 1,295	$ 4,279	$ 3,796