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Revenue (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) Municipality	Sep. 30, 2019 USD ($)
Revenue [Abstract]
Revenue from contracts with customers	$ 14,117	$ 13,549	$ 40,038	$ 38,176
Rents from regulated property	140	131	416	383
Total operating revenue	14,257	13,680	$ 40,454	38,559
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	8,902	8,460	$ 25,643	24,060
Water Utility Service [Member] | Commercial and Industrial [Member]
Revenue [Abstract]
Revenue from contracts with customers	3,774	3,864	10,331	10,630
Water Utility Service [Member] | Fire Protection [Member]
Revenue [Abstract]
Revenue from contracts with customers	795	780	2,379	2,290
Wastewater Utility Service [Member] | Residential [Member]
Revenue [Abstract]
Revenue from contracts with customers	446	334	1,281	878
Wastewater Utility Service [Member] | Commercial and Industrial [Member]
Revenue [Abstract]
Revenue from contracts with customers	78	72	229	203
Billing and Revenue Collection Services [Member]
Revenue [Abstract]
Revenue from contracts with customers	118	19	$ 147	56
Number of municipalities within the service territory provided service | Municipality			4
Number of days for customer to make payment after being invoiced			30 days
Collection Services [Member]
Revenue [Abstract]
Revenue from contracts with customers	0	16	$ 14	48
Number of days for customer to make payment after being invoiced			30 days
Other Revenue [Member]
Revenue [Abstract]
Revenue from contracts with customers	$ 4	$ 4	$ 14	$ 11

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