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Investments (Available for sale equity investments) (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Mar. 31, 2022
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Marketable Securities [Abstract] |  |
Amortized coxt, equity investments | $ 55,631 | $ 53,728
Estimated market value, equity investments | 61,357 | 72,307
Common stocks [Member] |  |
Marketable Securities [Abstract] |  |
Amortized coxt, equity investments | 29,577 | 27,674
Estimated market value, equity investments | 39,375 | 46,212
Non-redeemable preferred stocks [Member] |  |
Marketable Securities [Abstract] |  |
Amortized coxt, equity investments | 26,054 | 26,054
Estimated market value, equity investments | $ 21,982 | $ 26,095

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