Quarterly report pursuant to Section 13 or 15(d)

Margin Loan (Details)

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Margin Loan (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Line of Credit Facility [Line Items]      
Margin loan balance $ 2,940,000   $ 782,000
Proceeds from lines of credit 2,828,000 $ 3,771,000  
Repayments of lines of credit 9,654,000 5,966,000  
Margin Loan      
Line of Credit Facility [Line Items]      
Margin loan balance 2,900,000   $ 800,000
Proceeds from lines of credit 3,100,000    
Repayments of lines of credit $ 900,000    
Debt, weighted average interest rate 0.95%   0.98%
Interest expense, debt $ 18,632 $ 700,000  
Margin Loan | Median      
Line of Credit Facility [Line Items]      
Proceeds from lines of credit $ 14,200,000   $ 27,400,000
Margin Loan | Federal Funds Rate      
Line of Credit Facility [Line Items]      
Debt instrument, basis spread on variable rate 0.60%