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Stockholders' Equity - Additional Information (Details) - USD ($)
 12 Months Ended
Mar. 06, 2023
Mar. 08, 2022
Mar. 11, 2021
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Mar. 08, 2021
Dec. 31, 2020
Dec. 31, 2019
Termination date of stock repurchase program Mar. 31, 2024 Mar. 31, 2023 Mar. 31, 2022            
Common stock issued under dividend reinvestment plan       26,529 48,858        
Shares outstanding at end of period [2]       9,383,132 [1] 9,581,536 [1] 9,699,695 [1]   7,516,423 4,482,968
Stock repurchases, value       $ 4,355,000 $ 3,831,000 $ 1,827,000      
4.875% Notes Due 2026                  
Interest Rate       4.875%          
Stock Repurchase Program                  
Stock repurchase program, authorized amount             $ 10,000,000    
Period of stock repurchase program     1 year            
Stock repurchases, shares         167,017        
Stock repurchases, value         $ 3,800,000        
2022 Stock Repurchase Program                  
Stock repurchase program, authorized amount   $ 10,000,000              
Period of stock repurchase program   1 year              
2023 Stock Repurchase Program                  
Stock repurchase program, authorized amount $ 10,000,000                
Stock repurchases, shares       224,933          
Stock repurchases, value       $ 4,400,000          
[1] The Company completed a Reverse Stock Split of 10 to 1 effective August 26, 2021, the common shares outstanding and net asset value per common share values have been adjusted retroactively to reflect the split for all periods presented
[2] Totals may not sum due to rounding.