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Shareholders' Equity - Share Awards and Purchases (Details) | Sep. 21, 2020 $ / shares shares | Sep. 17, 2020 $ / shares shares | Jun. 30, 2020 $ / shares shares | May 19, 2020 trustee $ / shares shares | Mar. 13, 2020 $ / shares shares | Jan. 09, 2020 $ / shares shares
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of shares (in shares) |  | 360,000 |  | 60,000 |  |
Price Per Share (in dollars per share) | $ / shares |  | $ 3.77 |  | $ 2.94 |  |
Trustees |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of shares (in shares) |  |  |  | 10,000 |  |
Number of trustees | trustee |  |  |  | 6 |  |
Employees Of RMR LLC |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of shares (in shares) |  | 360,000 |  |  |  |
Former Employees Of RMR LLC |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock repurchased during period (in shares) | 42,180 |  | 1,757 |  | 1,500 | 1,938
Shares purchased for tax withholding and payment obligations (in dollars per share) | $ / shares | $ 3.38 |  | $ 4.43 |  | $ 3.79 | $ 8.10

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