CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating revenues
Total Operating Revenues	$ 88,141	$ 83,595	$ 80,411
Operating expenses
Utility operating expenses	40,338	39,189	38,330
Non-utility operating expenses	3,277	3,315	2,879
Depreciation and amortization	11,143	10,803	10,288
State and federal income taxes expense (benefit)
Current	8,073	8,420	4,172
Deferred	(2,389)	(3,239)	819
Property and other taxes	5,404	5,182	4,968
Total Operating Expenses	65,846	63,670	61,456
Operating income	22,295	19,925	18,955
Other income, net
Allowance for funds used during construction (AFUDC)	1,170	1,410	622
Miscellaneous (expense) income	971	614	953
Total other income	2,141	2,024	1,575
Income before interest charges	24,436	21,949	20,530
Interest charges	7,619	7,024	6,252
Net income applicable to common stock	$ 16,817	$ 14,925	$ 14,278
Income per common share:
Basic (in dollars per share)	$ 1.80	$ 1.61	$ 1.55
Diluted (in dollars per share)	$ 1.79	$ 1.60	$ 1.54
Weighted average common shares outstanding:
Basic (in shares)	9,327	9,277	9,239
Diluted (in shares)	9,369	9,326	9,293
Cash dividends per share of common stock (in dollars per share)	$ 1.01	$ 0.9837	$ 0.9549
Water Sales [Member]
Operating revenues
Total Operating Revenues	$ 76,476	$ 73,609	$ 70,829
Other Utility Operating Revenue [Member]
Operating revenues
Total Operating Revenues	6,525	4,916	4,456
Non-Utility Operating Revenue [Member]
Operating revenues
Total Operating Revenues	$ 5,140	$ 5,070	$ 5,126