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Stockholders' Equity - Additional Information (Details) - USD ($)
 3 Months Ended 9 Months Ended
Mar. 11, 2024
Mar. 06, 2023
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Termination date of stock repurchase program Mar. 31, 2025 Mar. 31, 2024                  
Common stock issued under dividend reinvestment plan     4,388     3,685     12,488 22,079  
Shares outstanding at end of period     9,231,454 [1],[2]     9,480,362 [1],[2]     9,231,454 [1],[2] 9,480,362 [1],[2] 9,383,132
Stock repurchases, value     $ 638,000 [1] $ 1,553,000 $ 953,000 $ 1,222,000 [1] $ 553,000 $ 792,000 $ 3,144,000 [1] $ 2,566,000 [1]  
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           60,559       123,253  
Stock repurchases, value           $ 1,200,000       $ 2,600,000  
Renewed Stock Repurchase Program                      
Stock repurchase program, authorized amount $ 10,000,000                    
Period of stock repurchase program 1 year                    
Stock repurchases, shares     33,429           164,166    
Stock repurchases, value     $ 600,000           $ 3,100,000    
[1] Refer to Note 9 “Stockholders' Equity” for additional information on changes in components of Stockholders' Equity.
[2] Totals may not sum due to rounding.