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Shareholders' Equity - Narrative (Details) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jan. 11, 2024 USD ($) $ / shares | Sep. 30, 2023 USD ($) trustee shares | Dec. 31, 2023 USD ($) shares | Dec. 31, 2022 USD ($) shares | Dec. 31, 2021 USD ($) shares | Dec. 31, 2020 shares
Scheduled to vest unvested shares |  |  |  |  |  |
Share-based compensation expense | $ |  |  | $ 1,840 | $ 1,733 | $ 1,960 |
Distributions to shareholders | $ |  |  | $ 9,595 | $ 9,568 | $ 9,540 |
Subsequent Event |  |  |  |  |  |
Scheduled to vest unvested shares |  |  |  |  |  |
Common distributions declared (in dollars per share) | $ / shares | $ 0.01 |  |  |  |  |
Distributions to shareholders | $ | $ 2,403 |  |  |  |  |
Certain our Officers and Employees of RMR |  |  |  |  |  |
Scheduled to vest unvested shares |  |  |  |  |  |
Shares purchased from certain of our officers and other employees of RMR LLC (in shares) |  |  | 184,344 | 133,752 | 109,384 |
Share Award Plans |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Remaining common shares available for issuance (in shares) |  |  | 1,938,197 |  |  |
Number of unvested shares (in shares) |  |  | 1,228,200 | 1,116,000 | 845,620 | 434,550
Scheduled to vest unvested shares |  |  |  |  |  |
2024 (in shares) |  |  | 428,200 |  |  |
2025 (in shares) |  |  | 377,200 |  |  |
2026 (in shares) |  |  | 270,400 |  |  |
2027 (in shares) |  |  | 152,400 |  |  |
Estimated future compensation for the unvested shares | $ |  |  | $ 2,489 |  |  |
Weighted average period over which the compensation expense will be recorded |  |  | 1 year 9 months 18 days |  |  |
Share Award Plans | RMR |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Number of trustees elected | trustee |  | 1 |  |  |  |
Officers and Employees | Share Award Plans | RMR |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Common shares awarded (in shares) |  |  | 800,000 | 707,000 | 718,000 |
Aggregate market value of shares awarded | $ |  |  | $ 1,864 | $ 919 | $ 2,448 |
Award vesting period |  |  | 5 years |  |  |
Trustees | Share Award Plans | RMR |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Common shares awarded (in shares) |  | 20,000 | 20,000 | 20,000 | 20,000 |
Aggregate market value of shares awarded | $ |  | $ 45 | $ 244 | $ 300 | $ 444 |
Market value of shares awarded to each Trustee | $ |  |  | $ 35 | $ 43 | $ 74 |

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