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Stockholders' Equity (Details) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 31, 2024 USD ($) vote $ / shares shares | Oct. 31, 2023 shares | Jan. 31, 2024 USD ($) vote $ / shares shares | Aug. 31, 2023 shares | Apr. 30, 2023 $ / shares shares
Equity [Abstract] |  |  |  |  |
Common stock, shares authorized (in shares) | 5,000,000 |  | 5,000,000 |  | 5,000,000
Common stock, par value (in dollars per share) | $ / shares | $ 2.50 |  | $ 2.50 |  | $ 2.50
Votes per share | vote | 1 |  | 1 |  |
Common stock, shares issued (in shares) | 2,908,000 |  | 2,908,000 |  | 2,833,000
Common stock, shares outstanding (in shares) | 2,875,000 |  | 2,875,000 |  | 2,830,000
Number of shares authorized to be repurchased (in shares) |  |  |  | 100,000 |
Purchase of treasury stock (in shares) | 27,033 | 2,423 | 29,456 |  |
Purchase of treasury stock excluding other fees | $ | $ 745,000 |  | $ 788,000 |  |
Remaining number of shares authorized to be repurchased (in shares) | 70,544 |  | 70,544 |  |

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