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Stock Plans (Detail Textuals) - USD ($) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Aug. 31, 2019 | May 31, 2019
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |  |
Number of shares repurchased | 17,000 | 77,000 | 222,000 | 137,000 |  |
Aggregate cost of shares repurchased | $ 541,000 | $ 887,000 | $ 2,279,000 | $ 1,552,000 |  |
New Stock Repurchase Program | Common Stock |  |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  | $ 1,000,000.0 | $ 8,000,000.0
Number of shares repurchased | 17,007 |  |  |  |  |
Aggregate cost of shares repurchased | $ 141,000 |  |  |  |  |
Shares repurchased, average cost per share | $ 8.30 |  |  |  |  |

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