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Commitments and Contingent Liabilities (Details) - USD ($)
 3 Months Ended 6 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Jun. 30, 2023
Jun. 30, 2022
Commitments and Contingent Liabilities (Details) [Line Items]        
Estimated incremental borrowing rate     4.03%  
Rental expenses under operating leases $ 200,000 $ 200,000 $ 400,000 $ 400,000
Construction program expenses     101,000,000  
Estimated obligation expenditure     $ 13,000,000  
Purchase Commitment [Member]        
Commitments and Contingent Liabilities (Details) [Line Items]        
Purchase commitment expiration date of contract     Nov. 30, 2023  
Average purchase     $ 27,000,000  
Regulated Water Utility [Member]        
Commitments and Contingent Liabilities (Details) [Line Items]        
Purchase commitment expiration date of contract     Feb. 27, 2026  
Average purchase     $ 3,000,000  
City of Dover [Member]        
Commitments and Contingent Liabilities (Details) [Line Items]        
Average purchase     $ 15,000,000