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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