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Credit Arrangements, Bank Debt (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 22, 2024
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
May 12, 2021
USD ($)
Bank Debt [Abstract]              
Net worth   $ 105,759 $ 98,746 $ 105,759 $ 98,746 $ 107,275  
Revolving Credit Facility [Member]              
Bank Debt [Abstract]              
Unsecured credit facility             $ 10,000
Maturity date       Apr. 12, 2024      
Outstanding borrowings   4,024   $ 4,024   $ 3,019  
Interest expense   77 $ 56 213 $ 142    
Available unused amount fee paid   3   6      
Available unused amount   $ 6,000   $ 6,000      
Debt instrument, effective interest rate percentage   7.35%   7.35%   9.69%  
Revolving Credit Facility [Member] | Minimum [Member]              
Bank Debt [Abstract]              
Indebtedness capital ratio   0.35   0.35      
Revolving Credit Facility [Member] | Amendment [Member]              
Bank Debt [Abstract]              
Maturity date       Mar. 22, 2027      
Basis spread on variable rate 2.00%            
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]       us-gaap:SecuredOvernightFinancingRateSofrMember      
Unused commitment fee 0.20%            
Revolving Credit Facility [Member] | Amendment [Member] | Minimum [Member]              
Bank Debt [Abstract]              
Net worth $ 64,200