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Stockholders' Equity - Additional Information (Details) - USD ($)
 3 Months Ended 9 Months Ended
Mar. 06, 2023
Mar. 08, 2022
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Termination date of stock repurchase program Mar. 31, 2024 Mar. 31, 2023                  
Common stock issued under dividend reinvestment plan     3,685     9,057     22,079 38,835  
Shares outstanding at end of period     9,480,362 [1],[2]     9,608,913 [1],[2]     9,480,362 [1],[2] 9,608,913 [1],[2] 9,581,536
Stock repurchases, value     $ 1,222,000 $ 553,000 $ 792,000   $ 2,459,000 $ 545,000 $ 2,566,000 [1] $ 3,004,000 [1]  
4.875% Notes Due 2026                      
Interest Rate     4.875%           4.875%    
Stock Repurchase Program                      
Stock repurchase program, authorized amount   $ 10,000,000                  
Period of stock repurchase program   1 year                  
Renewed Stock Repurchase Program                      
Stock repurchase program, authorized amount $ 10,000,000                    
Period of stock repurchase program 1 year                    
Stock repurchases, shares     60,559     0     123,253 129,617  
Stock repurchases, value     $ 1,200,000           $ 2,600,000 $ 3,000,000  
[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.