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Summary of Significant Accounting Policies, Deferred Compensation Plan (Details) - USD ($) | 12 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2021
Deferred Compensation Plan [Abstract] |  |  |
Carrying value of plan assets | $ 2,011,000 | $ 2,202,000 |
Deferred compensation obligation | 2,011,000 | 2,202,000 |
Expense related to the deferred compensation plan | 75,000 | 119,000 | $ 96,000
Short-term investments redeemed for the payment of deferred compensation liabilities | 297,000 | 0 |
Gain (Loss) on Equity Investments [Abstract] |  |  |
Net (loss) gain recognized on equity securities | (181,000) | 163,000 | 521,000
Less: net (loss) gain recognized on equity securities sold | (15,000) | 0 | 10,000
Unrealized (loss) gain recognized on equity securities still held | $ (166,000) | $ 163,000 | $ 511,000

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