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Marketable Securities (Narratives) (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2022 | Dec. 21, 2017
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |
Marketable Securities, Realized Gain (Loss) | $ 0 | $ 0 | $ 0 | $ 0 |  |
Unrealized Gain (Loss) on Investments | 362,000 | 145,000 | 558,000 | 214,000 |  |
Proceeds from Equity Method Investment, Distribution, Return of Capital |  |  | 313,000 | 324,000 |  |
Equity Method Investments [Member] |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |
Proceeds from Dividends Received |  |  | 313,000 | 324,000 |  |
EMC [Member] |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |
Increase (Decrease) in Accounts Receivable, Related Parties |  |  | 5,321,000 |  | $ 4,133,000 |
Equity Method Investments | 2,566,000 |  | 2,566,000 |  | $ 2,765,000 |
Investment Income, Net | $ 142,000 | $ (218,000) | $ 209,000 | $ 157,000 |  |
EMC [Member] | EMC [Member] |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  | 49.00%

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