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Investments (Available for sale equity investments) (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Mar. 31, 2023
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Debt Securities Trading And Equity Securities FvNi Cost [Abstract] |  |
Amortized cost, equity investments | $ 54,746 | $ 55,631
Estimated market value, equity investments | 62,036 | 61,357
Common Stock [Member] |  |
Debt Securities Trading And Equity Securities FvNi Cost [Abstract] |  |
Amortized cost, equity investments | 29,602 | 29,577
Estimated market value, equity investments | 42,045 | 39,375
Nonredeemable Preferred Stock [Member] |  |
Debt Securities Trading And Equity Securities FvNi Cost [Abstract] |  |
Amortized cost, equity investments | 25,144 | 26,054
Estimated market value, equity investments | $ 19,991 | $ 21,982

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