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Stock-based Compensation and Treasury Stock (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jan. 31, 2020 | Dec. 31, 2019 | Jan. 31, 2019 | Jan. 31, 2020 | Jan. 31, 2019 | Jul. 31, 2020 | Jul. 31, 2019 | Mar. 12, 2020
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Authorized amount under share repurchase program |  |  |  |  |  |  |  | $ 10,000,000.0
Management |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Shares exchanged (in shares) |  |  |  | 11,314 | 20,119 |  |  |
Fair value of common stock for the payment of payroll taxes associated with the vesting of shares under stock-based compensation programs |  |  |  | $ 213,000 | $ 305,000 |  |  |
Stock-Based Compensation | Minimum |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  | 2 years |  |
Stock-Based Compensation | Management |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Shares granted (in shares) |  |  |  | 0 |  |  |  |
Stock-Based Compensation | Key Executives |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Vesting period |  |  |  | 3 years |  |  |  |
Shares granted (in shares) |  | 95,000 |  |  |  |  |  |
Common stock per share (in dollars per share) |  | $ 18.87 |  |  |  |  |  |
Cost from stock compensation |  |  |  | $ 1,793,000 |  |  |  |
Stock-Based Compensation | Key Executives | Minimum |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  | 3 years |  |
Stock-Based Compensation | Key Executives | Maximum |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  | 5 years |  |
Stock-Based Compensation | Non-Employee Directors |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Shares granted (in shares) | 17,841 |  | 15,642 |  |  |  |  |
Share-based compensation expense |  |  |  |  |  | $ 358,000 | $ 339,000 |

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