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Interest Rate Swap Agreement (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Interest Rate Swap Agreement [Abstract]          
Outstanding borrowings $ 201,102   $ 201,102   $ 182,643
Interest Rate Swap [Member]          
Interest Rate Swap Agreement [Abstract]          
Notional amount of swap $ 12,000   $ 12,000    
Fixed interest rate 3.16%   3.16%    
Net payment rate on swap (0.03%) 0.01% (0.04%) 0.20%  
Interest rate swap settlements reclassified from regulatory assets to interest expense $ (1) $ 0 $ (3) $ 19  
Overall interest rate swap (gain) loss 252 $ (211) 15 $ (351)  
Interest rate swap settlements to be reclassified during the next 12 months 101   101    
Potential payment to counterparty $ 658   $ 658    
Interest Rate Swap [Member] | LIBOR [Member]          
Interest Rate Swap Agreement [Abstract]          
Percentage of variable interest rate 59.00%   59.00%    
Term of variable rate     1 month    
Interest Rate Swap [Member] | SOFR [Member]          
Interest Rate Swap Agreement [Abstract]          
Percentage of variable interest rate 59.00%   59.00%    
Basis spread adjustment 0.11448%   0.11448%    
Variable Rate Pennsylvania Economic Development Financing Authority Exempt Facilities Revenue Refunding Bonds, Series 2008A, due 2029 [Member]          
Interest Rate Swap Agreement [Abstract]          
Outstanding borrowings $ 12,000   $ 12,000   $ 12,000