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Revenue (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($) Municipality	Mar. 31, 2020 USD ($)
Revenue [Abstract]
Revenue from contracts with customers	$ 12,940	$ 12,739
Rents from regulated property	141	138
Total operating revenue	$ 13,081	12,877
Utility Service [Member]
Revenue [Abstract]
Number of days for customer to make payment after being invoiced	20 days
Water Utility Service [Member] | Residential [Member]
Revenue [Abstract]
Revenue from contracts with customers	$ 8,145	8,077
Water Utility Service [Member] | Commercial and Industrial [Member]
Revenue [Abstract]
Revenue from contracts with customers	3,310	3,341
Water Utility Service [Member] | Fire Protection [Member]
Revenue [Abstract]
Revenue from contracts with customers	806	801
Wastewater Utility Service [Member] | Residential [Member]
Revenue [Abstract]
Revenue from contracts with customers	471	410
Wastewater Utility Service [Member] | Commercial and Industrial [Member]
Revenue [Abstract]
Revenue from contracts with customers	79	76
Billing and Revenue Collection Services [Member]
Revenue [Abstract]
Revenue from contracts with customers	$ 119	15
Number of municipalities within the service territory provided service | Municipality	3
Number of days for customer to make payment after being invoiced	30 days
Collection Services [Member]
Revenue [Abstract]
Revenue from contracts with customers	$ 0	14
Number of days for customer to make payment after being invoiced	30 days
Other Revenue [Member]
Revenue [Abstract]
Revenue from contracts with customers	$ 10	$ 5

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