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General - Real Estate Investments and Nonutility Properties (Details)
$ in Thousands
Feb. 15, 2022
USD ($)
Oct. 29, 2021
USD ($)
property
Mar. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Accounting Policies [Abstract]        
Land     $ 12,615 $ 12,615
Buildings and improvements     45,058 45,017
Subtotal     57,673 57,632
Less accumulated depreciation and amortization     16,251 15,951
Real estate investment property, total     $ 41,422 $ 41,681
Property Two        
Schedule of Investments [Line Items]        
Gain on sale of real estate investments $ 5,442      
San Jose Water Company        
Schedule of Investments [Line Items]        
Number of properties sold | property   2    
Proceeds from sale of real estate held-for-investment   $ 13,150    
San Jose Water Company | Property One        
Schedule of Investments [Line Items]        
Gain on sale of real estate investments   7,230    
Properties selling expenses   277    
San Jose Water Company | Property Two        
Schedule of Investments [Line Items]        
Properties selling expenses   178    
Deferred gain on sale of properties   $ 5,442