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Summary of Significant Accounting Policies, Deferred Compensation Plan (Details) - USD ($) | 12 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2020
Deferred Compensation Plan [Abstract] |  |  |
Carrying value of plan assets | $ 2,202,000 | $ 1,652,000 |
Deferred compensation obligation | 2,202,000 | 1,652,000 |
Expense related to the deferred compensation plan | 119,000 | 96,000 | $ 79,000
Short-term investments redeemed for the payment of deferred compensation liabilities | 0 | 46,000 |
Gain (Loss) on Equity Investments [Abstract] |  |  |
Net gain recognized on equity securities | 163,000 | 521,000 | 96,000
Less: net gain recognized on equity securities sold | 0 | 10,000 | 193,000
Unrealized gain (loss) recognized on equity securities still held | $ 163,000 | $ 511,000 | $ (97,000)

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