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v3.22.1

Marketable Securities (Narratives) (Details) - USD ($) | 12 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2020
Gain (Loss) on Securities [Line Items] |  |  |
Net realized gains to sales of marketable securities | $ 0 | $ 85,000 | $ 50,000
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax | $ (5,279,000) | (13,297,000) | 8,010,000
Equity Method Investment, Ownership Percentage | 49.00% |  |
Proceeds from Equity Method Investment, Distribution, Return of Capital | $ 324,000 | 587,000 | 0
Unrealized Loss on Securities | 370,000 |  | $ 143,000
Foreign Currency Translation [Abstract] |  |  |
Unrealized Gain on Securities |  | 727,000 |
Equity Method Investments |  |  |
Foreign Currency Translation [Abstract] |  |  |
Proceeds from Dividends Received | 324,000 | 1,290,000 |
EMC [Member] |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Equity Method Investments | 2,765,000 | 3,040,000 |
EMC [Member] |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Due from Related Parties, Current | 4,133,000 | 2,250,000 |
Investment Income, Net | 212,000 | 715,000 |
EMC [Member] | Equity Method Investments |  |  |
Foreign Currency Translation [Abstract] |  |  |
Foreign Currency Transaction Gain (Loss), Unrealized | $ 163,000 | $ (213,000) |

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