Description of Business, Basis of Presentation, Corporate Transactions, Significant Accounting Policies, and Recent Accounting Pronouncements - Corporate Transactions (10K Only) (Details)								12 Months Ended
	Nov. 03, 2021 mi² active_water_connection	Aug. 28, 2020 USD ($) utility	Jan. 30, 2020 USD ($) $ / shares shares	Jan. 30, 2020 USD ($) $ / shares shares	Jan. 21, 2020 USD ($) $ / shares shares	Jun. 02, 2016 USD ($)	Jul. 14, 2015	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Aug. 02, 2021 USD ($)
Property, Plant and Equipment [Line Items]
Growth premiums received								$ 1,400,000	$ 200,000
Growth premiums received, lump sum								400,000
Regulatory asset								2,336,000	2,036,000
Contract liabilities								$ 19,797,000	18,580,000
Carrying cost on regulatory liabilities and assets								4.25%
Number of regulated utilities that filed a rate case application | utility		12
Number of regulated utilities | utility		18
Proposed collective revenue requirement increase		$ 4,600,000								$ 3,000,000
Issuance of common stock (in shares) | shares					870,000
Common stock (in usd per share) | $ / shares			$ 12.50	$ 12.50	$ 12.50
Gross proceeds from sale of stock			$ 1,600,000	$ 11,500,000	$ 10,900,000
Additional shares of common stock (in shares) | shares			130,000	130,000
Total proceeds from offering (in US dollars)				$ 12,500,000
Sale of stock total				$ 1,000,000
Pinal County | Geographic Concentration Risk | Service Connections Geographic Area
Property, Plant and Equipment [Line Items]
Percentage of customers on geographical basis		96.00%
Contributor
Property, Plant and Equipment [Line Items]
Tax expense on contributions								55.00%
Tax Payer
Property, Plant and Equipment [Line Items]
Tax expense on contributions								45.00%
Tax Cuts and Jobs Act
Property, Plant and Equipment [Line Items]
Contract liabilities								$ 800,000	700,000
Santa Cruz | Tax Cuts and Jobs Act
Property, Plant and Equipment [Line Items]
Aggregate annual revenue reductions								415,000	$ 1,000,000
Palo Verde | Tax Cuts and Jobs Act
Property, Plant and Equipment [Line Items]
Aggregate annual revenue reductions								669,000
Tonopah | Tax Cuts and Jobs Act
Property, Plant and Equipment [Line Items]
Aggregate annual revenue reductions								16,000
Northern Scottsdale | Tax Cuts and Jobs Act
Property, Plant and Equipment [Line Items]
Aggregate annual revenue reductions								5,000
Las Quintas Serenas Water Company, Inc
Property, Plant and Equipment [Line Items]
Active water connections | active_water_connection	1,100
Square miles of approved service area | mi²	2.5
Private Letter Ruling
Property, Plant and Equipment [Line Items]
Gain (loss) on condemnation						$ 19,400,000
Valencia Water Company
Property, Plant and Equipment [Line Items]
Growth premium receivable for each new water meter installed								3,000
Period for maximum payout of growth premium receivable							20 years
Maximum payout of growth premium receivable								$ 45,000,000