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Summary of Significant Accounting Policies, Deferred Compensation Plan (Details) - USD ($) | 12 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022
Deferred Compensation Plan [Abstract] |  |  |
Carrying value of plan assets | $ 1,837,000 | $ 2,011,000 |
Deferred compensation obligation | 1,837,000 | 2,011,000 |
Expense related to the deferred compensation plan | 6,000 | 75,000 | $ 119,000
Contributions made to deferred compensation plan | 82,000 | 287,000 | 388,000
Short-term investments redeemed for the payment of deferred compensation liabilities | 603,000 | 297,000 | 0
Gain (Loss) on Equity Investments [Abstract] |  |  |
Net gain (loss) recognized on equity securities | 347,000 | (181,000) | 163,000
Less: net gain (loss) recognized on equity securities sold | 74,000 | (15,000) | 0
Unrealized gain (loss) recognized on equity securities still held | $ 273,000 | $ (166,000) | $ 163,000

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