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