Revenue from Contract with Customer (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 10,757	$ 9,942	$ 28,876	$ 26,786
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	10,757	9,942	28,876	26,786
Deferred revenue - ICFA	17,446		17,446		$ 17,372
Contract with Customer, Asset, after Allowance for Credit Loss	2,309		2,309		1,717
Contract with Customer, Liability	18,151		18,151		17,959
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Deferred revenue - ICFA	17,446		$ 17,446		17,372
Revenue, Performance Obligation, Description of Payment Terms			within 15 days of billing
Revenue, Remaining Performance Obligation, Amount	17,400		$ 17,400
Regulated Operation [Member]
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	10,730	9,925	28,742	26,737
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	10,730	9,925	28,742	26,737
Contract with Customer, Liability	695		695		587
Unregulated Operation [Member]
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	27	17	134	49
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	27	17	134	49
Contract with Customer, Liability	10		10		0
ICFA | Unregulated Operation [Member]
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	0	0	0	0
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0	0	0	0
Water Services
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	5,492	4,963	13,555	12,344
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	5,492	4,963	13,555	12,344
Contract with Customer, Asset, after Allowance for Credit Loss	1,296		1,296		791
waste water and recycled water [Member]
Disaggregation of Revenue [Line Items]
Contract with Customer, Asset, after Allowance for Credit Loss	1,013		1,013		$ 926
waste water and recycled water [Member] | Regulated Operation [Member]
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	5,238	4,962	15,187	14,393
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	5,238	4,962	15,187	14,393
rental revenue [Member] | Unregulated Operation [Member]
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	26	16	133	48
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	26	16	133	48
Other Miscellaneous revenue [Member] [Member] | Unregulated Operation [Member]
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	1	1	1	1
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1	1	1	1
Residential [Member] | Water Services
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	3,623	3,151	9,564	8,652
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	3,623	3,151	9,564	8,652
Residential [Member] | waste water and recycled water [Member] | Regulated Operation [Member]
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	4,516	4,293	13,411	12,698
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	4,516	4,293	13,411	12,698
irrigation [Member] | Water Services
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	1,297	1,320	2,528	2,452
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,297	1,320	2,528	2,452
commercial [Member] | Water Services
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	224	228	642	583
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	224	228	642	583
commercial [Member] | waste water and recycled water [Member] | Regulated Operation [Member]
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	244	229	721	678
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	244	229	721	678
Other Water Services [Member] | Water Services
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	179	227	433	553
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	179	227	433	553
recycledwater [Member] | waste water and recycled water [Member] | Regulated Operation [Member]
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	419	335	891	717
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	419	335	891	717
other wastewater [Member] | other wastewater [Member] | Regulated Operation [Member]
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	59	105	164	300
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	59	105	164	300
constructionservices [Member] | Water Services
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	169	37	388	104
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 169	$ 37	$ 388	$ 104