CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating revenues
Total Operating Revenues	$ 90,859	$ 88,141	$ 83,595
Operating expenses
Utility operating expenses	41,414	40,338	39,189
Non-utility operating expenses	3,942	3,277	3,315
Depreciation and amortization	11,885	11,143	10,803
State and federal income taxes expense (benefit)
Current	3,360	8,073	8,420
Deferred	2,377	(2,389)	(3,239)
Property and other taxes	5,587	5,404	5,182
Total Operating Expenses	68,565	65,846	63,670
Operating income	22,294	22,295	19,925
Other income, net
Allowance for funds used during construction (AFUDC)	823	1,170	1,410
Miscellaneous (expense) income	1,302	971	614
Total other income	2,125	2,141	2,024
Income before interest charges	24,419	24,436	21,949
Interest charges	7,592	7,619	7,024
Net income applicable to common stock	$ 16,827	$ 16,817	$ 14,925
Income per common share:
Basic (in dollars per share)	$ 1.79	$ 1.80	$ 1.61
Diluted (in dollars per share)	$ 1.79	$ 1.79	$ 1.60
Weighted average common shares outstanding:
Basic (in shares)	9,394	9,327	9,277
Diluted (in shares)	9,426	9,369	9,326
Cash dividends per share of common stock (in dollars per share)	$ 1.05	$ 1.01	$ 0.98
Water Sales [Member]
Operating revenues
Total Operating Revenues	$ 77,821	$ 76,476	$ 73,609
Other Utility Operating Revenue [Member]
Operating revenues
Total Operating Revenues	7,195	6,525	4,916
Non-Utility Operating Revenue [Member]
Operating revenues
Total Operating Revenues	$ 5,843	$ 5,140	$ 5,070