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Summary of Significant Accounting Policies - Nonutility Properties and Real Estate Investments (Details)
12 Months Ended
Mar. 31, 2023
USD ($)
Oct. 29, 2021
USD ($)
property
Jun. 29, 2021
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Jun. 30, 2021
USD ($)
Components of Real Estate Investments [Abstract]              
Land       $ 4,137,000 $ 12,615,000    
Wholesale water supply assets       8,465,000 0    
Buildings and improvements       748,000 45,418,000    
Real Estate Investment Property, at Cost, Total       13,350,000 58,033,000    
Less accumulated depreciation and amortization       194,000 17,158,000    
Net nonutility properties and real estate investments       13,156,000 40,875,000    
Impairment of long-lived asset       0 0 $ 2,211,000  
Gain on sale of properties     $ 3,000,000        
Sales agreement, holdback amount             $ 3,000,000
Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract]              
2024       4,758,000      
2025       5,063,000      
2026       5,290,000      
2027       3,990,000      
2028       1,679,000      
Thereafter       0      
Warehouse Building              
Components of Real Estate Investments [Abstract]              
Land       13,170,000      
Buildings and improvements       44,950,000      
Real Estate Investment Property, at Cost, Total       58,120,000      
Less accumulated depreciation and amortization       17,270,000      
Net nonutility properties and real estate investments       $ 40,850,000      
Impairment of long-lived asset $ 0            
SJWC              
Components of Real Estate Investments [Abstract]              
Number of properties sold | property   2          
Proceeds from sale of real estate held-for-investment   $ 13,150,000          
Gain on sale of properties         7,230,000    
Properties selling expenses         277,000    
Deferred gains on sales of properties         $ 5,442,000    
Proceeds from sale of land held-for-investment   2,600,000          
Gain on sale of real estate investments   927,000          
Real estate selling expenses   $ 121,000          
Building and Building Improvements | Minimum              
Components of Real Estate Investments [Abstract]              
Estimated useful life       7 years      
Building and Building Improvements | Maximum              
Components of Real Estate Investments [Abstract]              
Estimated useful life       39 years