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Interest Rate Swap Agreement (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Interest Rate Swap Agreement [Abstract]          
Outstanding borrowings $ 160,497   $ 160,497   $ 142,110
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 0.16% 2.60% 0.30% 2.75%  
Interest rate swap settlements reclassified from regulatory assets to interest expense $ 5 $ 78 $ 19 $ 168  
Overall interest rate swap (gain) loss (267) $ (281) (140) $ (775)  
Interest rate swap settlements to be reclassified during the next 12 months 10   10    
Potential payment to counterparty $ 600   $ 600    
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