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Credit Arrangements, Bank Debt (Details) - Revolving Credit Facility [Member]
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
USD ($)
Jun. 30, 2023
Sep. 30, 2023
USD ($)
May 12, 2021
USD ($)
Bank Debt [Abstract]        
Unsecured credit facility       $ 10,000
Maturity date     Apr. 12, 2024  
Basis spread on variable rate   2.00%    
Outstanding borrowings $ 3,019   $ 3,019  
Minimum [Member]        
Bank Debt [Abstract]        
Indebtedness capital ratio 0.35   0.35  
LIBOR [Member]        
Bank Debt [Abstract]        
Interest rate floor   1.00%    
Variable rate term     1 month  
SOFR [Member]        
Bank Debt [Abstract]        
Basis spread on variable rate 0.11448%      
Interest rate floor 1.00%      
Variable rate term 1 month