Acquisitions (Details)			3 Months Ended	9 Months Ended
	Oct. 16, 2018 USD ($) mi² service_connection active_water_connection	May 30, 2018 USD ($) mi²	Sep. 30, 2020 USD ($)	Sep. 30, 2020 USD ($) perUnitItemType
Turner Ranches Water and Sanitation Company [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross		$ 2,800,000	$ 2,800,000
Active water connections		963
Area Of Certificated Service Areas | mi²		7
Red Rock Utilities [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross	$ 5,900,000			$ 5,851
Active water connections | service_connection	1,650
Area Of Certificated Service Areas | mi²	9
Red Rock Utilities [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross	$ 5,900,000
Active water connections | active_water_connection	1,650
GrowthPremiumPayableForEachNewMeterInstalled			$ 750	$ 750
Period for maximum payout of growth premium after first meter install	10 years
Period for Maximum payout of growth premium after acquisition date	20 years
Meters installed in the growth premium area | perUnitItemType				0