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Revenue (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) Municipality	Sep. 30, 2020 USD ($)
Revenue [Abstract]
Revenue from contracts with customers	$ 14,368	$ 14,117	$ 40,969	$ 40,038
Rents from regulated property	135	140	416	416
Total operating revenue	14,503	14,257	$ 41,385	40,454
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	8,872	8,902	$ 25,560	25,643
Water Utility Service [Member] | Commercial and Industrial [Member]
Revenue [Abstract]
Revenue from contracts with customers	3,952	3,774	10,891	10,331
Water Utility Service [Member] | Fire Protection [Member]
Revenue [Abstract]
Revenue from contracts with customers	827	795	2,428	2,379
Wastewater Utility Service [Member] | Residential [Member]
Revenue [Abstract]
Revenue from contracts with customers	481	446	1,426	1,281
Wastewater Utility Service [Member] | Commercial and Industrial [Member]
Revenue [Abstract]
Revenue from contracts with customers	79	78	237	229
Billing and Revenue Collection Services [Member]
Revenue [Abstract]
Revenue from contracts with customers	121	118	$ 360	147
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	18	0	$ 29	14
Number of days for customer to make payment after being invoiced			30 days
Other Revenue [Member]
Revenue [Abstract]
Revenue from contracts with customers	$ 18	$ 4	$ 38	$ 14

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Amount of operating lease income from lease payments and variable lease payments paid and payable to lessor. Includes, but is not limited to, variable lease payments not included in measurement of lease receivable.

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