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Marketable Securities (Narratives) (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2019 | Dec. 21, 2017
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |
Marketable Securities, Realized Gain (Loss) | $ 50,000 |  | $ 50,000 |  |  |
Unrealized Gain on Securities | 67,000 | $ 422,000 | 232,000 | $ 317,000 |  |
Proceeds from Equity Method Investment, Distribution, Return of Capital |  |  | 666,000 |  |  |
EMC [Member] |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  | 49.00%
Increase (Decrease) in Accounts Receivable, Related Parties |  |  | 5,032,000 |  |  |
Equity Method Investments | 3,451,000 |  | 3,451,000 |  | $ 3,602,000 |
Investment Income, Net | $ 223,000 | $ 230,000 | $ 515,000 | $ 402,000 |  |

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