CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating revenues
Total Operating Revenues	$ 83,595	$ 80,411	$ 82,235
Operating expenses
Utility operating expenses	39,189	38,330	38,277
Non-utility operating expenses	3,315	2,879	2,777
Depreciation and amortization	10,803	10,288	9,555
State and federal income taxes expense (benefit)
Current	8,420	4,172	(929)
Deferred	(3,239)	819	8,224
Property and other taxes	5,182	4,968	4,731
Total Operating Expenses	63,670	61,456	62,635
Operating income	19,925	18,955	19,600
Other income, net
Allowance for funds used during construction (AFUDC)	1,410	622	334
Miscellaneous (expense) income	614	953	226
Total other income	2,024	1,575	560
Income before interest charges	21,949	20,530	20,160
Interest charges	7,024	6,252	6,177
Net income applicable to common stock	$ 14,925	$ 14,278	$ 13,983
Income per common share:
Basic (in dollars per share)	$ 1.61	$ 1.55	$ 1.52
Diluted (in dollars per share)	$ 1.60	$ 1.54	$ 1.51
Weighted average common shares outstanding:
Basic (in shares)	9,277	9,239	9,175
Diluted (in shares)	9,326	9,293	9,242
Cash dividends per share of common stock (in dollars per share)	$ 0.9837	$ 0.9549	$ 0.9269
Water Sales [Member]
Operating revenues
Total Operating Revenues	$ 73,609	$ 70,829	$ 73,058
Other Utility Operating Revenue [Member]
Operating revenues
Total Operating Revenues	4,916	4,456	4,177
Non-Utility Operating Revenue [Member]
Operating revenues
Total Operating Revenues	$ 5,070	$ 5,126	$ 5,000