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Marketable Securities (Narratives) (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 21, 2017
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |
Marketable Securities, Realized Gain (Loss) | $ 0 |  | $ 0 | $ 0 | $ 0 |
Unrealized Gain on Securities | 195,000 |  | 67,000 | 682,000 | 232,000 |
Proceeds from Equity Method Investment, Distribution, Return of Capital |  |  |  | 587,000 | 0 |
Equity Method Investments [Member] |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |
Proceeds from Dividends Received |  |  |  | 1,290,000 |  |
EMC [Member] |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  | 49.00%
Increase (Decrease) in Accounts Receivable, Related Parties |  | $ 4,166,000 |  | 2,615,000 |  |
Equity Method Investments | 2,981,000 | $ 3,402,000 |  | 2,981,000 |  |
Investment Income, Net | $ 173,000 |  | $ 223,000 | $ 560,000 | $ 515,000 |

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