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Stockholders' Equity - Additional Information (Details) |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Mar. 08, 2022 USD ($) | Aug. 26, 2021 | Mar. 11, 2021 USD ($) | Sep. 30, 2022 shares | Jun. 30, 2022 USD ($) | Mar. 31, 2022 USD ($) | Sep. 30, 2021 USD ($) shares | Jun. 30, 2021 USD ($) | Sep. 30, 2022 USD ($) shares | Sep. 30, 2021 USD ($) shares | Dec. 31, 2021 shares
Termination date of stock repurchase program | Mar. 31, 2023 |  | Mar. 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued under dividend reinvestment plan | shares |  |  |  | 9,057 |  |  |  | 8,872 |  |  | 38,835 |  | 18,868 |  |
Shares outstanding at end of period | shares |  |  |  | 9,608,913 | [1],[2],[3] |  |  | 9,123,275 | [1],[2],[3] |  | 9,608,913 | [1],[2],[3] | 9,123,275 | [1],[2],[3] | 9,699,695
Reverse stock split |  | 0.10 |  | 0.10 |  |  |  | 0.10 |  |  | 0.10 |  | 0.10 |  | 0.10
Stock repurchases, value |  |  |  |  |  | $ 2,459,000 | $ 545,000 | $ 1,447,000 |  | $ 380,000 | $ 3,004,000 | [1] | $ 1,827,000 | [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 |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchases, shares | shares |  |  |  |  |  |  |  | 59,659 |  |  |  |  | 75,377 |  |
Stock repurchases, value |  |  |  |  |  |  |  | $ 1,400,000 |  |  |  |  | $ 1,800,000 |  |
Renewed Stock Repurchase Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount | $ 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period of stock repurchase program | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchases, shares | shares |  |  |  | 0 |  |  |  |  |  |  | 129,617 |  |  |  |
Stock repurchases, value |  |  |  |  |  |  |  |  |  |  | $ 3,000,000.0 |  |  |  |
[1] | Refer to Note 9 "Stockholders' Equity" for additional information on changes in components of Stockholders' Equity
[2] | The Company completed a Reverse Stock Split of 10 to 1 effective August 26, 2021, the common shares and net asset value per common share have been adjusted retroactively to reflect the split for all periods presented.
[3] | Totals may not sum due to rounding.

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